Interesting fact:

One of the great moments in Aliens features the late great Bill Paxton being forced to take part in a knife trick with the android Bishop. The actor was not informed that he’d be a part of it until just before the shoot. Makes for a nervous situation, huh? Especially when you consider that the actor had to do it for real. One take saw Lance Henriksen (Bishop) actually cut Paxton’s pinky with the knife. Yikes!