Common Mistakes in a Best Man Speech (And How to Avoid Them)

Most best men know roughly what they want to say. What catches them out is how they say it. Knowing the common mistakes in a best man speech is the fastest way to avoid them, and almost every one is easy to fix once you can see it coming. This guide walks through the errors that sink best man speeches at UK weddings and shows you what to do instead, so you can stand up with confidence and sit down to real applause.

Mistake One: Leaving the Writing Too Late

The most common mistake happens long before the wedding day. Many best men put off the speech until the week before, or worse, the night before, and the result is a rushed collection of half-formed stories. A speech written in a panic tends to ramble, repeat itself and lean on clichés because there was no time to cut anything.

Start at least three weeks out. Spend the first week simply collecting memories, the second drafting, and the third trimming and rehearsing. That gap also lets you sleep on the draft, which is when you notice the line that does not land or the story that runs twice as long as it should.

Mistake Two: Going On Too Long

The second mistake is length. A best man speech should run for five to seven minutes, which is roughly 650 to 900 words at a calm speaking pace. Anything beyond eight minutes and the room starts to drift, particularly if guests have been sitting through a long meal and several earlier speeches.

Most speeches that run long do so because the writer could not bear to cut a favourite story. Be ruthless. If a story needs three minutes of set-up before the punchline, it probably belongs in the pub rather than in the marquee. Read your draft aloud with a timer running, and cut until you are comfortably inside seven minutes.

Mistake Three: Inside Jokes Nobody Else Understands

Stories that make you and the groom howl with laughter can leave the other hundred guests staring politely at their napkins. Inside jokes are the single biggest cause of a flat room, because the audience cannot laugh at something they cannot follow.

Test every story with one question: could the groom's grandmother understand it without any explanation? If the answer is no, either give the background in a sentence or choose a different story. You are not performing for yourself and the groom. You are speaking to the whole room, from the bride's elderly relatives to the groom's colleagues.

Mistake Four: Crossing the Line With Humour

Everyone knows that a best man speech should be funny, and that is exactly where many go wrong. The classic errors are jokes about ex-partners, stag do stories that would embarrass the groom in front of his new in-laws, and anything that makes the bride feel second-best or the groom look foolish for the wrong reasons.

The test for any joke is whether the groom will laugh at it with his grandparents listening. Affectionate teasing works because it shows you know him well. Humiliation does not work because it shows you were not thinking about the room. If you are unsure about a line, cut it. A speech that is warm and mildly funny beats one that is hilarious and uncomfortable every time.

Do Not Forget the Bride

Another humour trap is forgetting that the bride is part of the day. A speech that is entirely about the groom's past, with no warm word for her, leaves her sitting through five minutes about a life she was not part of. Include at least a few sincere sentences about her, and about what the two of them are like together.

Mistake Five: Starting With an Apology or a Cliché

The first twenty seconds set the tone. Opening with "I am not very good at public speaking" or "I was only asked to do this last week" tells the room to lower its expectations. Equally, a dictionary definition of the word love or a tired line about not knowing why you were picked rarely earns more than a polite smile.

Instead, open with a short, confident line that introduces who you are and your connection to the groom, then move straight into your first story. A simple, warm opener with a touch of humour gets the room on your side far better than any apology.

Mistake Six: Forgetting the Basics

It sounds obvious, but a surprising number of best men forget to thank people, introduce themselves or propose the toast. Guests who do not know you will want to hear who you are and how you know the groom. The couple's parents and anyone who contributed to the day deserve a brief thank you. And the speech must end with a clear toast, with the room asked to raise their glasses to the bride and groom.

If you want a full checklist of the content a speech needs, our guide on [what to include in a best man speech](https://speechcraft.co/blog/what-to-include-in-a-best-man-speech) covers every section in order.

Mistake Seven: Relying on Alcohol

A drink to steady the nerves is understandable. Several drinks is a recipe for slurred words, lost places and jokes that seemed funnier in your head. Alcohol also dulls your timing, which is the one thing comedy cannot do without.

Keep to a single drink before you speak, or none at all, and save the celebrating for after the toast. You will remember the speech better, and so will everyone else for the right reasons.

Mistake Eight: Not Rehearsing Out Loud

Reading a speech silently in your head is nothing like delivering it to a room. Words that look fine on the page can be awkward to say, and jokes that work in writing may need a pause to land. Many best men only discover this when they are already standing up with a microphone in hand.

Rehearse out loud at least five times. Do it standing up, in front of a mirror or a trusted friend, and speak slower than feels natural. Nerves speed everyone up, so a pace that feels almost too slow in your living room will sound just right in the marquee. Print your speech in a large font or put it on cards so you can find your place easily if you lose it.

Mistake Nine: Ignoring Your Own Voice

Some best men copy a speech from the internet, or borrow jokes from a comedian, because they feel they are not funny enough. The trouble is that borrowed material rarely sounds like you, and guests can tell. A story that is genuinely yours, told plainly, will always land better than a polished joke that belongs to someone else.

If you find the writing itself the hard part, you are not alone. Plenty of best men know the stories but struggle to shape them into a structure with a strong opening, a sincere middle and a clean finish. Our guide to [best man speech structure](https://speechcraft.co/blog/best-man-speech-structure) shows how to put the pieces in the right order.

How to Fix All of These at Once

The simplest way to avoid every mistake above is to plan. Choose two or three stories that show who the groom really is, write a short warm paragraph for the bride, keep the whole thing to around seven minutes, and rehearse until the words feel like yours. You do not need to be a natural comedian. You need to be sincere, prepared and aware of the room.

If you would rather have a personalised best man speech written for you, built around your actual stories and delivered in minutes, Speechcraft can write it for you at [speechcraft.co/best-man](https://speechcraft.co/best-man).

Frequently Asked Questions

What is the biggest mistake in a best man speech? The most damaging mistake is telling jokes or stories that embarrass the couple or exclude most of the room. Inside jokes and anything involving ex-partners are the worst offenders. Choose stories that every guest can follow and that the groom would be happy to hear repeated in front of his family.

How long should a best man speech be? Five to seven minutes is the sweet spot, which is around 650 to 900 words. Going beyond eight minutes risks losing the room, particularly if other speeches have already been given.

Is it okay to mention the groom's ex-partners? No. It is almost never worth the risk. It can upset the bride, her family and the groom himself, and it takes the focus away from the couple. Keep your humour about the groom's quirks, habits and friendship with you.

Should I drink before giving the speech? One drink at most is sensible, and none is better. Alcohol affects timing and memory, and a clear head will help you deliver the speech smoothly. Save the celebrating until the toast is done.

How do I stop being nervous before my best man speech? Preparation is the best cure. Rehearse aloud several times, keep your notes somewhere easy to read, and slow your pace deliberately. Take a breath before you begin and look for a friendly face in the room. Most guests are rooting for you.

When should I start writing my best man speech? Ideally three weeks before the wedding. That gives you time to gather stories, draft, step away, edit and rehearse, which produces a far more natural result than a speech written the night before.