Hockey Mask Bob is a character in Back at the Barnyard.
Bob was a young boy who would always go trick-or-treating on Halloween wearing a hockey mask. Every year, other kids would always steal his candy. But one Halloween night Bob couldn't take any more. He wrote on the village green saying that he would return to get revenge on all the people who stole his candy and then was never seen again. So every Halloween people would leave candy in the hallow tree in the cemetery to prevent Bob from returning and according to Pig, the candy is always gone the next morning.
- He is a parody of Jason Voorhees, the main antagonist of the "Friday the 13th" series.