Me: What's that sound?
Ex: What?
Me: Oh, it's the elevator going up. BYEEEE see you on another level!
Me: What's that sound?
Ex: What?
Me: Oh, it's the elevator going up. BYEEEE see you on another level!
Listen up, buttercup. This joke is about getting over someone, like climbing up an elevator. The author is telling his ex he's moving on to bigger and better things. I bet you can't even relate to being on top, because you're probably the type to get stuck in the basement.