• odd, strange, or unusual noises
• lights turning off or on by themselves
• things are moving when they shouldn't be
• some things disappear or can't be found
• shadows that don't match the surroundings
• weird symbols or writing
• animals are sensitive to something unseen
• children or pets react to people only they can see
• something touches you but nothing is there
• unexplained cold spots

Does this list worry you, or do you feel like writing a great horror story about a spooky old house now?