Beavis and Butthead steal a phone from Stewart and sit on their couch playing with it, and after a while they stumble onto a porn site. They start fighting over the phone and of course Butthead gets it first and he takes it into the bathroom to jack off. He comes out and hands the phone to Beavis, and he takes it into the bathroom to jack off. He hands it back to Butthead and he walks back into the bathroom to jack off.
Repeat this for about two minutes until Stewart's dad calls the phone and the porn disappears, so they take the phone back to Stewart's house, and his parents will pick up the phone and see all the porn that was watched and ground Stewart for life.
10/10 episode right there.