When I was a kid, I got really freaked out by a film called "Horror Express". It had Peter Cushing in it and was about a monster that was found frozen and was taken back on a train but thawed out on the way and started killing everyone. The thing that scared me was the way that the monster wipes clean the brains of its victims (literally - they took the top of a skull off a victim and the brain was
smooth). Urrrgh!
Horror Express
Also, there was a scene in Carry On Screaming that bothered me, when the professor regenerates Oddbod Junior using just a finger as a starting point! Scarey stuff for someone under 10!
Carry On Screaming