Tree House of Horror II: A Simpsons Halloween - S3-E7
Corrected entry: At Moe's tavern, the beer in everyone's glasses is very odd. In Barney's glass the liquid is shaped like a hand, and the other guy's glass is shaped like a half-oval, with foam coming out of it. (00:11:35)
Correction: Odd is permissible in the Tree House episodes. Some of the normal rules don't apply.
tw_stuart