Great quip....
Here is one I had to go fish off another old forum. Happened a couple of years ago. (PG-13 warning)......
Today in fact I decided to participate in my local Coffee Klatch which consists of about 8 (+ or - 2) guys I used to work with, who like myself are retired. 90% of the conversation centers around politics, sports, personal ailments, and how much our wives are bitching at us. Conversation as usual was lively, I of course gave the details of my computer wrist issue.
Then, I looked over at my friend K____. He was wearing a contraption, with wires underneath his shirt, which I knew was one of those cardio-monitors. I slyly mentioned mentioned that "Wow K___ ...what is that? has L___ slapped a GPS device on to keep up with your ass? (Go To Hell Glance No. 1).
About 5 minutes later K___ pulls a out a piece of paper and starts writing on it. I snatch it from him, and asked what is this? Come to find out he has to document all his activities while the monitor in place. On the instructions...... I noticed and announced. You gotta tell these guys every time you urinate and deficate? isn't that 2 or 3 feet form your heart? (Go To Hell glance No. 2)
Finally, I noticed No. 6 on the activity list....... "Record any sexual activity". K__???? I don't see any sex on this sheet? What's wrong with you?
I then offered him what I thought was a very profitable dare..... K____? I'll give you $100 if you write down on your activity log..... Blow Job with a Smiley Face behind it.

. One condition, you've to give me an update of any reaction or feed back on that entry from the medical community.
(GoTo Hell look No. 3 and he didn't take the damned dare.)