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Beavis and Butt-head vs. the Vending Machine - S4-E28
Other mistake: When Butt-head is purchasing the pork rinds from the vending machine, he notes that the selection for them is F2. When he is pressing the buttons to dispense them, he presses the F button twice, but never the 2 button. Somehow, the machine still dispenses the correct item.
Beavis: Hey Butt-head, is it normal for the inside of your bunghole to itch?
Butt-head: Beavis, it's not even normal to ask.
Trivia: Mike Judge not only received complaints about "Beavis and Butthead", but also some death threats, including a poem about the writer wanting to kill him.