Gary is the main antagonist of the Bob's Burgers episode "Christmas in the Car". He is a bitter, angry truck driver who drives a candy cane-shaped truck.
The Belchers first get on Gary's bad side by cutting him off and honking repeatedly at him on Christmas Eve (they were actually stuck in the snow and Linda was trying to play "Jingle Bells" with the car horn). After that, he stalks them all the way home and seems to be trying to run them off the road. Gary finally traps the Belchers when they get stuck again and gets out of his truck, challenging Bob to fight him. It turns out that he is a sad, lonely man who hates his job. Bob allows him to release his frustration by punching him in the stomach, and Gary agrees to tow them out of the snow. Linda then offers him the family's Christmas tree.