South Park: Season 2, Episode 10

2 - 10: Chickenpox

Kenny comes down with the chickenpox, so the boys' parents send them to his house to catch the disease while they are still young. Stan and Cartman soon become sick, but Kyle remains healthy and is furious when he learns what his parents did. He and the boys plan their revenge. Meanwhile, Sheila tries to rekindle the friendship between Kyle's dad and Kenny's dad.