Continuity mistake: In the first hospital scene, where a kid dies by the hook-tipped chains in the operating room, there is a point where his head just explodes. Later, when Joey opens the door, for a second you can clearly see the kid's body, still with a head.

Hellraiser III: Hell on Earth (1992)
Ending / spoiler
Directed by: Anthony Hickox
Starring: Doug Bradley, Ken Carpenter, Kevin Bernhardt, Lawrence Mortorff, Terry Farrell
Joey arrives at the club after the massacre to find her cameraman dead.When confronted by Pinhead she is chased through the city by three new cennobites:one that spits napalm,another that fires CD's and one with an camera eye.Then in a construction site she meets the new Terri Cennobite.Using the box she sends them back to hell.She Then meeting her father she gives him the box.He turns out to be Pinhead in disguise and they appear in the attic.Monroe appears and him and Pinhead become one again.Joey stabs him with the puzzle box in order to send him back to hell.Back in the construction site Joey pushes the box into some concrete.Years later skyscraper lies on the very spot with designs of the box across the walls.
Oreo
Joey: Oh, Doc. No.
Camerahead Cenobite: Have you seen what he did to me, you little bitch? Have you seen?
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Chosen answer: It's a piston. 2 piston rods are jammed through his head and they move powered by something unknown. You can see the crank shaft and part of some sort of cylinder. A piston is part of an internal combustion engine. It's part of his cenobite form since he liked cars.
lionhead