My favourite was the episode of Hammer House Of Horror was "Two Faces Of Evil", I remember when Gary Raymond is chasing his wife into a barn, she then thinks she's safe, but turns round and her kid is in the barn as well, and it turns out he's a doppleganger as well, with horrible teeth, she then pleads to the farmer, screaming that she's being chased/attacked. When she turns round, her husband and child are waving at her from the barn, that was one of the most frightening things I watched when I was a kid.....chilling stuff, but marvellous all the same. I also liked the Sapphire and Steel adventure with the army ghost who haunted an old railway station, and he used to whistle "Pack Up Your Troubles In Your Old Kit Bag", my Dad used to whistle that just to freak me out hahaha.....