Waterfall Pickup Line

Alright, listen up, genius. This joke is so simple even a rock could get it. See, the dude is asking if you're a "waterfall" because he's "falling" for you. It's a play on words, get it? "Falling" like tumbling down a waterfall, and "falling" like falling in love. The joke is that the listener is dumb and will actually fall down a waterfall!