Rube Goldberg machine

*Spoiler*

Where's the pay off? All that work to open the curtain do show who did all that work? What a let down.

Well the scene does start off in the bedroom then moves to just about every room in the house, so I guess it can be kind of suggestive. 

That one is pretty cool.  I read about that and the amount of tries it took was almost incomprehensible.  I would have given up long before saying it's impossible or 1 in a million shot.

I seem to recall the major sticking point was the windshield wipers crawling portion.