To Hell with "Jeopardy!" - Any Dopers been on "Wait, Wait... Don't Tell Me"?

Not sure if this has been discussed before…

… so anyway. Many Dopers have been on Jeopardy! - but has anyone been a call-in contestant on Wait, Wait… Don’t Tell Me? What was the experience like? How does it work? When they pick you as a contest, do they call you to play, or give you a special number and time to call in? How did you get Carl Kasell’s voice on your answering machine? (do they send you a CD, or an audio file over the internet, or something else?)

I haven’t, but youtube has some voice mails by Carl Kassell that people have uploaded. Here is one.

Ryan’s Phone