My favourite has always been Two faces of evil, scared the shit out of me as a kid.
Second is the Peter Cushing one.
Having said that, i like them all and find them an easy enjoyable watch.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.