A woman named Melanie in Ventura, California had a strange experience while sitting on her own living room sofa. While just staring at the wall, she became, she believes, invisible. Her husband walked around the house looking for her. He even walked right by her - just a few feet away - and did not see her. The episode lasted about 10 minutes, then suddenly she was visible again...



http://paranormal.about.com/cs/humanenigmas/a/aa112403.htm