Steer Cereal

Listen up, buttercup. This joke is funny because it's a play on words. "Steer" sounds like "cheer," as in Cheerios cereal. And cows eat, you know, because they're alive and hungry, just like you when you finally roll out of bed after noon. Unlike you, cows eat grass, not cereal. Time to moo-ve on to something smarter, huh?