Especially if he has a chainsaw.
Two Norwegian friends were on a long road trip from Norway to Sweden and decided to stop for a little rest. When the passenger fell asleep, the driver saw a great opportunity to have a little bit of fun and pull a prank. After making sure that his buddy was deep in his sleep, he pulled out a bladeless chainsaw and started grinding it like a mad man right next to his friend's throat. What happened next was absolutely hysterical and had us rolling on the floor laughing.
One thing we're certain of after watching is that this will definitely be the last time this guy falls asleep in his friend's car. We wouldn't be surprised if he's already plotting his revenge.