Love Potion # 9 -
This is a really old movie (1992), one of Sandra Bullocks first I do believe. It also stars Donovan Somebodyorother. They're both scientists and they get ahold of a love potion and hilarity ensues. Wait, his name is Tate Donovan. Anway, there's a really funny part involving a hooker, the love potion, and the scientist. (Those are words I don't think I've ever strung together in a sentence before.) If you can find this at the video store, you should rent it. Its a good light movie that doesn't involve a lot of thinking.
Anyway, its a good movie about friendship and marriage and kids and all that stuff.