The best pranks include someone fearing for their life. Just ask those people in the elevator in Brazil.
YouTube celebrity types Rhett and Link stick to that pranking philosophy by making unsuspecting folks think they're seconds away from a vicious dog attack. Don't worry, though -- it's only a prank, and Cee-Lo's cat shows up.
BONUS: 10 Awesome Pranks to Play On Your Facebook Friends
[nggallery id=9731]