(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.) Bart: Sorry.