You're walking down the sidewalk and you see a guy with his arm in the air. If you're in New York, you'll know he's hailing a cab. This guy thought it'd be funny to run up and give them high fives. How do you think these New Yorkers took to his prank?
Halloween changes people. Put a mask on somebody, and they change. Spring a prank on some TV news talking heads and hilarity ensues, as this video clearly shows. Some get the joke, others totally fall apart and get upset. Enjoy.
The one advantage of having super-broke roommates is that they don't have the extra cash to spring on giving your room a pretty, pretty princess makeover while you're overseas travelling. This man did not have that advantage.