I had a finite math teacher in high school. I ran into a certain situation a few times that truly perplexed me. Not to be crude, but no matter what situation (never during a quiz or test) if I asked to use the restroom...I would get a no. Now, to me, this is the equivalent of refusing someone to blink, to sneeze, I may even go as far to include breathing.
These are all inevitable things a human must do on a day to day basis.