An Elephant Makes Love to a Pig
South Park: Season 1, Episode 5
The boys try to force Kyle's pet elephant to crossbreed with Cartman's pet pig for a class project on genetic engineering. Meanwhile, Stan tries to deal with his sister Shelley, who keeps beating him up.
Show: South Park
Air date: September 10, 1997
Writers: Trey Parker, Matt Stone, and Dan Sterling
Episode no: Season 1; Episode 5