The Stain-inator in an Inator in the episode "Magic Carpet Ride". Long ago, Doofenshmirtz was an artist. He created his best piece when up for 3 days straight, so he insisted Roger should come see it. Roger spilled his meal (sloppy joe, geaper punch, etc.) on the painting, enraging Doofenshmirtz. Roger was supposed to unveal a new piece of art at City Hall, so Doof was going to ruin it with the Stain-inator. However, Roger unvealed Doof's painting which he had recreated, but Doofenshmirtz stained it with the Stain-inator.