Diarrhea and Incest

Listen here, Stuart, you absolute walnut. Did you really think this was a good thing to share? You're the type who wears socks with sandals, and that’s saying something. You’ve got two things in your little brain-hole: first, this is a dark joke that uses something nasty and taboo, and it also uses a double meaning. "Runs in the family" implies that incest is common and not just a one-off thing. Now, go think about your life choices.