The first secret to writing a funny best man speech is to gather a long list of jokes. The funny best speech. Make sure to write up some funny stories about you and the Groom. A funny best man speech requires at least 3 big jokes to get the crowd lightened up. The laughs are good to break initial silence and loosen everyone up at the wedding. I’d recommend a few one-liners but you need longer jokes to even out your best man speech. It is very important for you to avoid racial slurs and other jokes that may be offensive. A funny best man speech is supposed to be lighthearted, not ruin the night.