When a group of South Park residents is trapped inside a TV studio, they decide to resort to cannibalism after 4 hours. They draw straws to see who they're going to eat first. The same thing is done in a deleted scene from Cannibal! In both cases, every straw is the same length. Thanks to Saki for the info.
Episode 202 - "Cartman's Mom is Still a Dirty Slut"