The first guy I dated gave me this book when he saw on my myspace page that I liked horror stories. Despite it's dreadfully cliche cover art, many of the shorts it contained were quite creepy and interesting.
I later lent the book to a friend who, apparently, lost it in the abyss that was her bedroom, or rather, her mother threw it out as she was allegedly prone to doing with things her daughter put in the closet (???).
Anyway these were the short stories the book contained:
The Kit-Bag by Algernon Blackwood.
Here There be Tygers by Stephen King.
The Room in the Tower by E.F. Benson.
Beyond Lies the Wub by Philip K. Dick.
Feeding the Dog by Susan Price.
Teddies Rule, OK? by Nicholas Fisk
Grendel the Monster by Eleanor Farjeon
A Grave Misunderstanding by Leon Garfield
Captain Murderer by Charles Dickens (from The Uncommercial Traveler)
Something by Joan Aiken
The Hand by Guy de Maupassant
The Boy Next Door by Ellen Emerson White
The Murder Hole from a Scottish Folktale
The Famous Five Go Pillaging by Terry Jones and Michael Pillaging.
The Affair at 7 Rue De M by John Steinbeck
A Change of Aunts by Vivien Alcock
The Cask of Amontillado by Edgar Allan Poe
The Pear-Drum from an English folktale
The Dog Got Them by Philippa Pearce
Gabriel-Ernest by H.H. Munro
Nule by Jan Mark
The Dancing Partner by Jerome K. Jerome
The Ring by Margaret Bingley
The Troll by T. H. White.