At a stoplight, a car waits behind a moped, whose rider is checking to see if something's wrong with his bike. The light turns green, the car starts honking, and then the moped rider shuts the car up pretty fast by brandishing a freaking axe.
The moral of the story is twofold: don't be an asshole, and you never know if the guy you're honking at is a complete nutbar.
You can see the video in higher quality here.
(Hat tip to Sir Spiegels-A-Lot!)