Angry turkeys only exist after a player completes the [Friend or Fowl?] achievement. After completion, all swarm of turkeys will turn hostile and attack the offending player. This is only temporary, however, and once the swarm is killed, surrounding turkeys return to their normal passive state.
This achievement is an obvious reference to the Legend of Zelda series, where players are attacked by cuckoos if they spend too much time abusing them. --Gormolak (talk) 05:44, November 12, 2010 (UTC)