Gary is after sweet revenge on the bookie at the races many years ago who didn't pay him any place winnings after the horse finished third in a four horse race.
Gary is after sweet revenge on the airline staff member who was dismissive of him the time that he was travelling and asked at the ticket counter if he could be upgraded from economy to first class just so he'd be more comfortable.
Gary is after sweet revenge on a peddler who sold him a garden gnome. Gary bought the gnome very cheaply but is angered when the paint washes off somewhat in the rain.
Gary is after sweet revenge on the talking macaw - which he thinks is a parrot - at the pet shop who called him a loser in front of a number of laughing onlookers.