Useless but fun...
Laurel & Hardy
Since so many had not heard of this classic comedy duo, here are a few clips:
"I'll Say He's Different" and "Another Fine Mess"
What's a Mathemagician?
I know we have quite a few good math students in the room, but I've not yet met one who can hold a candle to Arthur Benjamin. Pull out your calculator, try to keep up, and prepare to be amazed!
By the way, I first found this presentation on TED Talks (subtitled "Ideas Worth Spreading"). This site features 15-mintue talks by people who are considered to be the smartest in their fields. It's kind of hit-or-miss, but I usually find something thought-provoking there.