From Beyond (1986)
Bubba uses a small, hand-held, square light near the start of the film to search for the fuse box.
Close to the end of the film, Bubba uses what looks to be a black 2D Maglite to distract the swarm of other-worldly, flesh-eating, insects that are attacking Katherine and Robert. He tosses the light away, knowing that the insects will go after the light. Unfortunately the flashlight lands in a group of heavy cables, and the beam shines directly onto Bubba himself. With horror, he realizes what is about to happen . . .
Near the end of the film, after escaping from the hospital, Katherine goes back to the house to destroy the evil machine. She goes up to the attic, and uses what is possibly a black 4D Maglite in order to carefully place her bomb, and set the timer. (No clue where she got the bomb from, especially so quickly; and considering it did look at least a bit sophisticated. :shrug
This horror films deals with a unique aspect of horror and the supernatural that is quite creative. Unfortunately this film is also top contender for "Most Over The Top, Gory, Special Effects in a Film Ever."