Why Joe is Cool

Listen up, buttercup. You wanna know why this "Joe" dude is supposed to be cool? Well, the joke is missing the punchline! I'm guessing Joe is cool because his name sounds like 'Joule' which is a unit of energy. It's all about the setup, and this joke is a swing and a miss, just like your attempts at humor, I bet. You probably still think the Earth is flat, huh?