Jim Davis' writers obviously ran out of ideas. It's not cool when you reference your own strip in a joke.
Runners-up: Argyle Sweater, Baby Blues, Blondie, Brewster Rockit: Space Guy!, Dennis the Menace, Family Circus, Frank and Ernest, Mother Goose and Grimm, Non Sequiter, Pickles, Red and Rover, Rhymes with Orange, Sally Forth, Speed Bump
Not a really strong day. Imagining the sound effects was kind of fun.
Runners-up: Pearls Before Swine, Single and Looking