Relax!!! Give the guy some credit...do you think he would do this in a true clinical setting? I know from working in CCU that nurses, both male and female, can have a pretty crude sense-of-humor...and it's not limited to CCU (doc's, RT's etc. etc.). The thing is they deal with a lot of stuff i.e. death, feces, vomit, death, family members, did I mention death? If they didn't find some way to laugh, it would eat them alive. Okay, maybe they are a little crude sometimes, but sometimes "knock-knock" jokes just don't cut it. And by-the-way, I'm the class clown...but I know when to keep my mouth shut (To self: maybe this was one of those times).