acting with professionalism in the face of juvenile humour

me, to a co-op: Do you know where [other co-op] is? Is he coming in?

co-op: Yes, he texted me. He is at home, having a diarrhea.

me, suppressing a smirk: ok. You can just say he's not feeling well, you don't have to be specific.

co-op, completely serious: I disagree. It is better to be precise.