Don't Overdo the Humor
One thing you want in your wedding toast is some humor. The goal is to have people laughing and enjoying themselves. Toasts have a good chance of going sideways because the toastmaster was basically doing a dry run of his burgeoning stand-up comedy act. Try to stick to amusing anecdotes rather than jokes, and keep the family impersonations to a minimum. When it comes to the old "war stories" from the college days, remember that your goal is to make people smile and laugh, not cringe. The event belongs to the bride and groom, so try not to upstage them.