pop a cap

The result of reverse-biasing an electrolytic capacitor. Consequences include but are not limited to an explosion of smoke, flame, and electrolytic goo complemented by a sharp "BANG."

Engineering Student A: "What smells like an electrical fire?"

Engineering Student B: "Dude, I think you put that capacitor in backwards."

"BANG."

Professor: "Did somebody just pop a cap in my lab?"

*Cue Students A and B snickering*

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