A few years before Stewart made it big with The Next Generation, he had a supporting role in the B-movie schlockfest, Lifeforce (1985) a very weird, disjointed sci-fi horror movie (the type of dreck reviewed by Phelous).
It starred Spooks' Peter Firth, a SAS officer who's out to stop a evil space chick that goes around in the nude. She possesed Patrick Stewart's character, who is taken back to Whitehall in a British Army helicopter, and on the trip back you hear a violent farting sound and then the camera turns on a unconvincing plaster caste of Stewart's head that is spurting out loads of blood
(you can see it on this TNG spoof edit).
It reminds me of David Warner's comedic plate glass decapitation in The Omen (1976) who was also in The Next Generation.
It starred Spooks' Peter Firth, a SAS officer who's out to stop a evil space chick that goes around in the nude. She possesed Patrick Stewart's character, who is taken back to Whitehall in a British Army helicopter, and on the trip back you hear a violent farting sound and then the camera turns on a unconvincing plaster caste of Stewart's head that is spurting out loads of blood

It reminds me of David Warner's comedic plate glass decapitation in The Omen (1976) who was also in The Next Generation.