MacReady was the Thing at the end and not Childs...
I always come across this question all over YouTube. The answer seems simple. People don't like to admit that MacReady was the Thing. At the end it's only Childs and MacReady, but Childs is the only one with a weapon. If Childs was the Thing he'd kill a weaponless Macready right away, but he doesn't. Macready hands him his bottle with his backwash in it and Childs takes a drink, so MacReady laughs because he now turned Childs.
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