Up

With Pixar lately I've caught myself wondering how they'll make it work. I didn't see how they could keep 'Wall-e' going for 90 minutes. Didn't get how a story about a rat that wanted to be a chef could possibly click. Now comes 'Up' about a house that flies around hooked up to a bunch of balloons. How do you keep that interesting for more than five minutes? Latest teaser feels like watching paint dry. I'm sure they'll deliver, though.