Okay, okay, I just know that this topic was covered to death long ago, but I wasn't here long ago.
Well, I was dog and house sitting and was channel surfing out of boredom and happened on a 1987 episode of Mama's Family where Thelma Harper (Mama) goes on Jeopardy! after a bizarre remote contestant tryout. Unreal funny stuff during the quiz show, and apparently this was live, not taped, since the family watched it without Mama being there. What a contrast with a real Jeopardy! episode where Alex snapped at a woman contestant, also in the center position, "Don't mess with me....You'll only hurt your self."
Then there was the probably more famous 1990 "Who is...Cliff Clavin" episode on Cheers. This lived on in Alex remarking, "He couldn't be caught, unless he pulled a Cliff Clavin."
Two movies that I can think of where Jeopardy! was prominent are Rain Man, 1988, and White Men Can't Jump, 1992.
Now for my questions. Are there other TV or movie Jeopardy appearances? Has any other real game/quiz show been similarly featured? Obviously both parties in these "deals" thought "win-win" where the prestige and/or publicity was beneficial. I wonder who first approached whom?