"Well id just like to say that me and (grooms name) go back a long way.......thats enough about our foreskins" Good night, im here all week. I'll get me coat cos taxi's here
If you're making the speech then you could just talk about yourself all the time, maybe your dog, some phones, it'd be great fun, think you could manage that?
Seeing as it's you How about "Last time I was Best Man, it was at a Muslim wedding. My jokes went down like a bomb - everyone thought they were hilarious." Sorry Maxwell.