It's funny how The Simpsons manages to stay on air and yet be sometimes distinctly not for children. For example school handy man, redheaded scotsman Willy is leaving in a huff, and saying to Principal Skinner: "now you won't have your Willy to slap around anymore".
And Skinner has been effectively imprisoned by rebellious school kids, they have put him into the sack which normally holds the dodge balls, only his head sticking out. Skinner tries to escape by telling the lab hamster: "chew through my ball sack". Oddly, the hamster sees nothing appealing about it and scurries away.