I *love* this movie. It terrified me deliciously on late-night TV when I was 12 or so, and when I discovered it on video in recent years I found it just as enjoyable as I remembered. [I admit that I no longer have to whip back the sheets to reassure myself that there's no skull in the bed, but as a kid I enjoyed several highly dramatic bedtimes because of "The Screaming Skull"...]
And the ghost in the greenhouse (plus funky theme music) still strikes me as a standout spook clip. Over the top? Maybe - but if a horror movie can't be over the top, what can?