In early 2009, Burger King decided to tear apart friendships in the name of free Whoppers.
If you don't remember (or have blocked this time-period from your brain due to emotional trauma) BK ran a promotion called the Whopper Sacrifice in January, '09. The premise was simple: unfriend 10 people on Facebook, gain a coupon for one free Whopper in the process.
The only thing worse than being unfriended in the name of a lone stupid-ass fast-food cheeseburger (priced at roughly $5, depending on location) is getting notified that one of your former friends ditched your online companionship for 1/10th of a Whopper. Which happened. Every time.