Drinking battery acid and eating fireworks

A local policeman had just finished his shift on one cold November evening and was at home with his wife.

"You just won't believe what happened this evening, I've never seen anything like it in all my years on the force."

"Oh, yes, dear, what happened ?"

"I came across two guys down by the canal, one of them was drinking battery acid and the other was eating fireworks."

"Drinking battery acid and eating fireworks! What did you do with them?"

"Oh, that was easy, I charged one and let the other off."