This movie is completely hysterical. It's even funnier if you've spent any time at all in theater dealing with actors and all their quirks. I was on the tech crew for the play version of this movie when I was in 9th grade, so I have all sorts of memories about this show and the people who were in it. I love the cast in this. John Ritter (I wish he weren't dead) is wonderful. Marilu Henner is great. Michael Caine is always good. And Christopher Reeves doesn't creep me out in this (I don't know why but he usually does, maybe because I can usually only picture him in that wheelchair).
Hysterically funny, especially if you know even a little about theater.