An investigation at one of Britain's "most haunted" places has thrown up some spooky results.
It's spooky down there!
A total of 200 volunteers took part in the study at the underground streets of Mary King's Close in Edinburgh.
Professor Richard Wiseman sent the volunteers to four locations - two of which were said to be haunted, although the volunteers didn't know that.
Around 70% of them felt spooked in the "haunted" places, with just 48% of them getting the creeps in the other areas.
"Sometimes people just felt very cold, but there were feelings of being watched, being touched and having clothing pulled," said Professor Wiseman.
But he thinks the volunteers' experiences were probably more to do with the environment and the power of the mind, rather than ghosts.
Experiments showed that the "haunted" locations were colder than the others and that traffic noise above one of them made a rumble too quiet for the ear to pick up, but was known to make people feel uneasy.