Q: What is unspecified obstruction of renal pelvis and ureter?

A: A fun game I learned at the S&M dungeon. I push something inside you, obstructing the flow of your urine,  and you have to guess what it is.

Since all I have is a Buzz Lightyear, it shouldn't be too hard to guess.

Shoot. I wasn't supposed to tell you. Oh well, you'll still get off on the pain.

Look, for S&M relationships to work, someone has to be the Masochist. The role of the Sadist has already been taken.