Yep, Paul!
Ya know, the reason I brought up Mr. Hitchcock here is because the ironic twist ending of Ian's joke remined me of one of my all-time favorite old Alfred Hitchcock Present episodes. It's titled "A Dip in the Pool", and starred one of favorite old character actors, Keenan Wynn.
If you have a little time here(about half an hour), I invite you take a look and see if you don't agree that there is a similar ironic ending to this episode as there was to Ian's joke...
http://www.youtube.com/watch?v=GLz2vqwr13c
