Revenge of the Bogey Man (1983)

(Original title: Boogeyman II)

Lacey, the shaken survivor of a bloody supernatural rampage in the countryside, is flown to Los Angeles where a slick movie producer plans to cash in on her story. At a decadent Hollywood party, plans for the beginning of a new horror movie franchise are torn asunder when a fragment of the original haunted mirror turns these hotshot movers and shakers into screamers and quakers!

Revenge of the Bogey Man was on the uk video nasties list but wasn't prosecuted! Released in re-edited form with additional footage in 2003.