My kids and I laugh every time we think of a scene from this show where Mark gets a perm.....which one is it??? Thanks!

That's "Help Wanted". It aired March 14, 1988 during season three (Valerie's Family). As a matter of fact, here's the scene in question: http://www.youtube.com/watch?v=KfBdXAM6VHU :)

Thank you so much - we were just talking about this again today - I can't wait to watch it to see if it's as funny as we remember!!