A young American tourist goes on a guided tour of a creepy old castle in England.

“How did you enjoy it?” the guide asked when it was over.
“It was great,” the girl replied, “but I was afraid I was going to see a ghost in some of those dark passageways.”

“No need to worry,” said the guide. “I have never seen a ghost in all the time I’ve been here.”
“How long was that?” she asked.
“Oh, about 300 years.”