There is a phenomenon in psychology, I forget the term, but it basically involves your brain creating fake memories.

They took a guy, and had his parents and people he trusted tell him about this one time he had been lost in a mall for hours when he was young, and the police had gotten involved in a search for him. He started to remember that incident, talking about how he had been really scared and he went into detail about the incident.

The incident never happened. His brain fabricated all of that. Just because someone says they saw something, doesnt mean they did.

There's a very fine line between not listening, and not caring. I like to think that I walk that line every day of my life. -Leonard Church-