Reality has much lower standards than fiction
First, go check squid314.livejournal.com/275614.html out. Marvel at the shoddy storytelling the Universe gets away with.
Second, go see Toy Story 3 - I don't even want to spoil it, though the ending probably qualifies as a good test if your friends and loved ones have been replaced by Pod People if they aren't at least misty-eyed at the ending (it's a GOOD sad though! Go see it!)