Here are the two I have that are totally true.
As kids my parents had friends in Orange Hills off of Chapman. They told about how they had a ghost that would turn faucets and lights on and off. One night all of us kids were in their family room watching TV. They had a big floor lamp for lighting and even though all of us kids were sitting on the carpet and the couches a shadow of a man walking in front of the lamp and the shadow moving left to right....just like the same shadow you would see as if someone was walking in front of a lamp. But there was no one there....shadow but no body.
More recently, I was living in a Condo in Lake Forest and used to always see things out of the corner of my eye and one time caught an orb in a picture. One morning I got up and went downstairs to use the downstairs bathroom and start the day. Im an early riser so typically am the first one up. Anyhow, im sitting on the toilet and hear foot steps come down the stairs. I think its just my wife who for whatever reason got up before her normal rise time. So I hear the footsteps come down and some movement in the living room and then footsteps on the kitchen floor. But as Im listening I start realizing the footsteps on the kitchen floor sound just like a woman in heels clicking and clacking as they walk. So I start thinking to myself its odd my wife would be up early and even stranger wearing heels in the morning. I finish my business and walk out to find no one there....go upstairs and both my wife and kids are still sleeping. I made no mention as I didnt want to scare her but after we moved I told her the story...she confided in me that when she was up late at night the TV would go on by itself and even when turned off she would hear electrical pops and occasional static burst through the speakers.
Feel free to share your stories. Here are some lists of rumored haunted locations....if you can confirm or deny any of these is part of our annual tradition as well.
Reportedly haunted locations in California - Wikipedia, the free encyclopedia
Shadowlands Haunted Places Index - California
Scary Haunted Places in California