Rage Faces can be used by certain awkward individuals, who seem to lack the power of speech necessary to express how they truly feel and are therefore forced to express themselves via Faces of Rage.
Watch this video closely so you'll know who to avoid as you make your way through the urban jungle. And you'd better hope that you don't get stuck in an elevator with that guy, because I'm pretty sure he has a smell to go along with his Coolface!
--via Geekologie