A few years ago, a student of mine constantly tried to avoid work by saying he had to go to pee. He had run out of passes but continued to protest loudly that he had to "go". He eventually came to class with a note and a smug look on his face.
"I've got a doctor's note saying I have a medical condition, so you have to let me use it whenever I want."
I looked at the note. I reread it.
"Student, is this a joke?"
"What?" his smile droops a little.
"Was the doctor joking around?"
"Why?" he started to get angry.
"It says here 'When student drinks a lot of water, he needs to urinate.'"
"Student... When ANYONE drinks a lot of water, they need to urinate. This doesn't tell me that you have a medical condition."
I don't know if the doctor used poor wording or if he was a genius.