In the UK lemonade is a carbonated soda. I thought that was the root of the joke, with a cultural confusion. The other commenters seem to think it’s a pee joke? But if it was, it wasn’t funny so I think I’m right.
That said, my interpretation isn’t funny either? What is this post?
Depends on how you parse the prompt. The red ball is on top of (the white ball with a blue ball on top).