So immature

So, we were doing a Listening Practice in one of my classes- where they listen to a CD and answer questions. The page had a map of a library and it asked questions about it. One question was: "Mr. Chen is on the first floor with his son when his son says he has diarrhea. Where should he go?"

Only one person in the classroom laughed- actually, it was more of a big snorty guffaw.

Yes, that person was me.