38 years after the classic movie’s release, there’s finally an answer to a theory about Aliens unforgettable knife trick scene. Early in James Camerons Alien sequel, the android Bishop (Lance Henriksen) gives a demonstration of his superhuman abilities, pulling off a crazy trick with a knife, with crewmate Hudson (Bill Paxton) as an unwilling victim. Hudsons shocked reaction in the scene is so convincing that its long been rumored that Paxton was actually unaware of what was about to happen, and could only hold on tight as Henriksen performed the finger-risking stunt.