Genius Bonus: In "The Itch", the eponymous song was sung by rats, the "dance" was actually rodential fans scratching their fleas, and the song was to the tune of "Ring Around the Rosary". And it was set in the Middle Ages. Everything about it was a reference to The Black Death.
Nightmare Fuel: The gooey alien in invasion of the body slammers. what really sells it is its freaky smile when impersonating Tom or Jerry.