It's been a little while since I've seen Mrs Doubtfire, but you're right, what he does is actually pretty crazy and creepy. I guess we're willing to accept things in movies that would never be okay in real life!

As far as movies I know word for word, I'd have to say When Harry Met Sally, the Harry Potter films, and a few Christmas movies that I tend to watch every year. There are probably others too but those are the ones I can think of off the top of my head!