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(In science lab, Bart is about to mix two substances.)
Ms. Melon: (to Bart) Say, what's that? It looks dangerous.
Bart: Well, it's really pretty top secret, ma'am.
Ms. Melon: All right, keep going. But you do know what happens when you mix acids and bases, right?
Bart: 'Course I do.
(Bart pours one substance into another, it explodes and covers the whole room in the yellow mixture.)