Rent Doom Asylum (1987)

When a group of horny teens wind up on the grounds of a creepy abandoned asylum, they think they've found the perfect place to party. Little do they know that inside the building's crumbling walls lurks a freakishly deformed maniac, driven to madness by the tragic loss of his fiancée. With an array of grisly surgical tools at his disposal, it's only a matter of time before the youngsters begin meeting various splattery ends at the hands of the ghoulish Coroner.