Incognito (Beavis and Butt-Head episode)
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Beavis and Butt-Head goof off in class by flicking a fork off the table. It accidentally hits Earl, a deranged student. The next day, the pair disguise themselves by putting on hats, wearing sunglasses, and putting on foreign accents. They claim to be "extra-strange students" named Crevasse and Bung-Head. Someone shoots the pair, but it's not Earl. In fact, it is a criminal outside, who was shooting at Earl. Earl eventually gets his gun confiscated.