Try to catch Just a Minute on the radio/internet sometime. It’s a long-running panel game. A player of the game will try to talk on a subject for 60 seconds without the other participants spotting hesitation, deviation or repetition.
I think this could be the magic formula for making vendor presentations at conferences more interesting. A chairman introduces a subject (SOA, web services, RoI, …) and one of the contestants starts taking until… bzzz… an opponent spots one of the three violations. If the challenge is correct, they get points and take on the topic for the remaining time. The winner gets to give out t-shirts, CDs or give closing remarks or something.