Spoilers for TS3 in white below - but really Bouncy, don't read them, see the movie (and 2 too, they are both great fun!):
First off, all the toys are almost burned as trash and join hands, accepting their imminent death. That's the one that got me.
In the end, Andy gives away his toys to a little girl and tells her how great they are. He had decided to keep Woody, finds him in the box unexpectedly, hesitates for a moment, then gives him to the girl too.