Here's a dumb prank to play on someone. A guy posted a video on YouTube where he hides an uncooked piece of pasta in his mouth. Then he goes up to random people on the street and asks if his nose looks like it's broken.
And while they're looking at it, he pretends to try to reset it . . . and bites down on the pasta to make a crunching sound. Everyone he does it to FREAKS OUT.
(Search for "Best Broken Nose Prank." Don't miss the reaction at 1:24.)