The first thing that came to my mind when I read this post was the episode of the Justice League animated series where Flash and Lex Luthor swap bodies.
Henchman: Aren't you going to wash your hands? (lex has just left the men's room) Flash-Lex: No, because I'm EVIL!
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Henchman: Aren't you going to wash your hands?
(lex has just left the men's room)
Flash-Lex: No, because I'm EVIL!