In Cronenberg's much-lauded remake of The Fly, Seth Brundle (Jeff Goldblum) dissolves Stathis Borans' hand and foot by regurgitating his corrosive fly vomit on it. My uncle described this at the time (1986), and I didn't think much of the idea, but you have to see it to grok the whole vomit drop phenomenon.
I taped the campy sequel, The Fly II, but it's been 5-6 years since I saw it. Not only does "Martinfly", genetic successor to "Brundlefly", dissolve limbs, but as this review notes, he gets the head of one of the evil overlord's guards (warning: very graphic). Also, the movie is worth while just to see Daphne Zuniga chewing the scenery. She's further over the top here than as Princess Vespa in Spaceballs. No, really!
Also, note to bioinformaticians: what gene expression modeling program is complete without Skin Lump Simulation?