... you can learn from:
The Fly (1986)
Seth Brundle: How does Brundlefly eat? Well, he found out the hard and painful way that he eats very much the way a fly eats. His teeth are now useless, because although he can chew up solid food, he can't digest them. Solid food hurts. So like a fly, Brundlefly breaks down solids with a corrosive enzyme, playfully called "vomit drop". He regurgitates on his food, it liquifies, and then he sucks it back up. Ready for a demonstration, kids? Here goes...
I will save you guys a gif of his "demonstration" -- don't say I never did anything for ya, kids. Anyway today is the 30th anniversary of David Cronenberg's film The Fly, which was a huge hit (the #23 film of 1986!) and which I sometimes I think could be his best movie. It's not the purest display of what makes Cronenberg Cronenberg -- that'd probably be Videodrome. And it's not my favorite (although it's definitely top three) -- that'd probably be Dead Ringers. But it is easily his most accessible, while remaining 100% fucked up at the same time, so I mean his "best movie" in the cinematic sense. It is his best entertainment. And Jeff Goldblum & Geena Davis give wonderful performances - a real romance for the ages... steeped in regurgitated sludge.