Boring Conference

You are at some medical conference.
Some dork is giving an hour lecture on something absolutely, ridiculously, painfully boring.
Have one of your friends pose as a blind man and walk into the lecture hall with his rottweiler "guide dog."

Have him position himself at the side of the stage so the crowd cannot see him.

Wait til its about half way over and have your friend throw a juicy steak right at the speakers head and at the same time let go of the rottweiler's leash.

The rottweiler will obviously trample the speaker as he goes for the steak and give a new meaning to the term stage fright, forever.