What was the thing that Beethoven used the most?
THE OVEN! (BeethOVEN)
Okay, so you know Beethoven, right? That old composer dude? Well, his name sounds like "Beeth-oven." And an oven is a thing in the kitchen that gets hot. So the joke is that he used the oven the most. Get it? You probably don't, because you don't strike me as a smart fella.