2. Brundlefly's foot-dissolving spew, The Fly (1986)
There aren’t many frames from David Cronenberg’s remake of The Fly that won’t twist your stomach into knots like a pretzel, but one of the film’s most memorable moments comes when Seth Brundle (Jeff Goldblum) vomits up a corrosive enzyme that dissolves Stathis Borans’ right foot. As if watching the flesh bubble and pull apart like string cheese isn’t foul enough, listening to the gurgling of Brundle’s deadly stomach acids puts this scene over the top.
The bit isn’t without its scientific merit, as Brundle’s acidic vomit is similar to what actual flies do to their food before they eat in an attempt to break it down for easier ingestion. Grounding in reality won't make you any less queasy, though.