A man walks into a bar. He gets very drunk and asks the bartender where the restroom is.

The bartender explains it's the third door to the right, but the man goes into the third door to the left. He finds a large golden toilet. The man takes a big poop in it and leaves.

He continues to return to drink there every week, and every time he goes to poop in that golden toilet.

One day he finds the golden toilet is gone, so he asks the bartender about it.

The bartender exclaims, "So you're the one who's been pooping in my tuba!"