What you’re looking to do with any great best man speech is almost pose a question at the beginning and then spend the rest of the speech answering it. That might sound confusing but it’s really very simple: if the groom was passionate about football as a kid, then how did he end up an accountant. If you go this way then you can have fun with his character traits, his hair colour, and even his dress sense. it gives you a full range of literary weapons to choose from and much greater creative license. Or in other words – you can just make stuff up.