I did this one for a friend of mine that wants the hulk to help potty train her son. All I could keep hearing in my head is a twisted rendition of the REM song singing "Everybody Poops".
Anyway, I did this on paper with pencil first, then ink, then scanned it on the old computer and did a quick paintbucket fill for the colors. Added the text at the top and here it is. Didn't spend a whole lot of time on it, but I'm glad I got to work at last.
Enjoy... and remember, everybody poops.