The Stuff MB512

The Stuff is a satirical science fiction horror film released in 1985. The plot, bearing some resemblance to The Blob and Invasion of the Body Snatchers, involves a mysterious gooey substance from beneath the surface of the Earth which is sold as a dessert, brainwashing the minds of its consumers.

The Muppet Babies episode "The Air Conditioner at the End of the Galaxy" uses footage from the film of "the stuff" wreaking havoc in an enclosed room to represent the Babies' spaceship melting when they get too close to The Sun.

Wikipedia has an article related to: