Theoretically, servers should earn their tips, right? Better service, bigger tip. That makes sense. But then there are the innovators. Those who can be as unprofessional as they want - because they let the tip jar do the talking for them. It's a cunning, irresistible ruse guaranteed to trump any screwed up coffee order. So mazel tov, creative baristas of the world. You beat the system. Now buy yourself something nice.