I'd probably have my laptop with me (I always do, I take it everywhere), so I'd play episode 57 of Cardcaptor Sakura ("Sakura, Shaoran, and the Elevator"). It's one of my favorite episodes.
That'd probably kill off about 1/3 of the time it takes them to get us out (I'd assume it takes about an hour to un-stick an elevator), so after that, it'd depend on the circumstances. If there were other people in the elevator, I'd most likely just talk or whatever until the rescue teams came. If not, I'd just lay down and take a nap or something (I can sleep anywhere, including on floors; hopefully I wouldn't scare the rescue teams into thinking I was dead or anything).