Yellow and Can't Swim

Alright, listen up, buttercup. You think you're so smart, huh? But you probably also think water is wet. This joke is a play on words, see? You expect the answer to be something yellow that can't swim, like a rubber ducky or something. But BAM! It's a bus full of kids, because buses are yellow and, well, buses can't swim, especially when filled with noisy children who probably smell like feet.