Well, as you may have already figured out, I'm a fan of many things, but Pixar's movies hold a very special part in my fanness. Except for Finding Nemo, for which I found no interest whatsoever, I love them all. And Up was certainly up (no pun intended) to my high standards. It's got all I love in the Pixars, i.e. hilarious jokes quickly followed by very dramatic scenes. In Nemo there was humour indeed, but not the intensity of the sad scenes Pixar is able to produce. In all the others, Monsters Inc particularly, I literally go from laughing of out to crying my eyes out in about 2 seconds, and I love that.
Up didn't fail in making me up (the voice of that dobberman was hilarious!!) and down (all those poignant flashback scenes), but I think what really did the trick was the realism felt with the 3D special feature (I could have hold the house in my palm...) with the main character, who reminds me an awful lot of a professor in my business school.
And who has never dreamt of flying with balloons, who has never dreamt of having a flying house? Who's never dreamt of both?