In the movie Garfield Gets Real, an animated Garfield movie aimed towards kids, the creators used an incredibly vulgar fan made comic wherein Jon threatens to sodomize Garfield if he doesn't help
Garfield' Creator Denies Popular Fan Theory Where Jon Drinks Dog Semen | HuffPost Entertainment
Jon by Gail Galligan - Neatorama
If Garfield the cat is dead, what is the world depicted in the comic strip? - Quora
Jon (comic strip) | Garfield Wiki | Fandom
The Best Thing Online This Week Is This Garfield Fan Comic | Digg
How This Cartoon Made Everybody Love Garfield Again | Cracked.com