The scene where one man gets his arms torn off when this hands are inside the torso of a 'dead' friend comes to mind. Then they set the Thing on fire and the head tears away from the body and grows spider legs, waddles off. And the scene in the dog pen. Ugh.
I actually haven't seen the prequel, but the few clips online I've seen seem pretty gross. Haha.
Lol that's the part with Palmer's classic line; 'You gotta be ****ing kidding'