Toowomba, Australia mother of two Kylie Steger says her appetite was ruined when she found a "rude surprise" at the bottom of a burger box from fast food chain Hungry Jack's: a crude drawing of a penis.
The offensive doodle has put Steger off her weekly dinner visits to the restaurant, where she often took the kids after football and netball practice.
"It literally made me sick," she said. "If they have drawn that in there, what else have they done to my burger?"
A Hungry Jack's spokesman says the company has launched an internal investigation to determine the identity of the artist.
Jonah Hill's character from Superbad has not yet been ruled out as a suspect.