ARE YOU EATING IT …OR IS IT EATING YOU?
A delicious, mysterious goo that oozes from the earth is marketed as the newest dessert sensation, but the tasty treat rots more than teeth when zombie-like snackers who only want to consume more of the strange substance begin infesting the world.
I saw just enough of this as a kid for it to give me the screaming heebie-jeebies.
This, Invaders from Mars, and the 1978 version of Invasion of the Bodysnatchers also freaked me the heck out.
Close Encounters of the Third Kind was also terrifying to me. Again, I only saw bits and pieces.