I love a good hypocrite. I've seen this a couple times in my years on DeviantART.Scenario #1:
Person #1 made a comic decrying art theft that they allegedly suffered at the hands of their sibling, and stamps telling people not to steal or trace someone else's work. #1 just so happens to use pictures in their stamps that don't belong to them, and also steals backgrounds and patterns for use in their artwork.Scenario #2:
Person #2 is my favorite. #2 drew a picture making fun of yaoi hands that was reposted on Tumblr without their permission and went viral. It received more attention than their original upload, and #2 complained about it, saying it wasn't fair or right. In a hilarious twist of irony, it turns out that #2 runs an entire blog on Tumblr dedicated to stealing peoples' art and making fun of it.