I was terrified by one of the Enid Blyton "Chimney Corner Stories" where a wet umbrella is put into a sink to drain and comes upstairs to terrorise the family (or something along those lines).
"Dark is Rising" - LOVED those books! I can remember:
When the dark comes rising, six shall turn it back
Three from the circle, three from the track
Wood, bronze, iron, water, fire, stone
Five shall return and one go alone
Iron for the birthday, bronze carried long
Wood from the burning, stone out of song
Fire in the candle-ring, water from the thaw
Six stones the circle and the grail gone before
Fire on the mountain shall find the harp of gold
Played to wake the sleepers, oldest of the old
Power from the green witch, lost beneath the sea
All shall find the light at last, silver on the tree
And I still have a 100% belief that humanity will succumb to some John Wyndham-like disaster thanks to reading all of his books as a child.