I wouldn't necessarily call "pinch zoom" surprising, though, b/c the first thing I thought after seeing it was, _this is so intuitive -- i.e. unsurprising -- yo

I wouldn't necessarily call "pinch zoom" surprising, though, b/c the first thing I thought after seeing it was, _this is so intuitive -- i.e. unsurprising -- you never have to show anyone twice_. The wow-factor is less surprise, and more delight.