I second toastmasters -- it really helped me discover what aspects of teaching I enjoy. My tip would be to use stories/anecdotes, especially for something mean

I second toastmasters -- it really helped me discover what aspects of teaching I enjoy. My tip would be to use stories/anecdotes, especially for something meant to be entertaining (vs. informative) for a best-man's speech. Think of some funny memories that can be linked together to give insights into the personality of the groom.