Memory is an interesting thing. I once claimed to somebody I was seeing that I had done/said something humorous, fully believing that it was my own experience. It was only when he mentioned hearing that joke from a famous standup comedian that it really hit me - I think what really happened was that I watched a clip a long time ago, and thought hey that's the kind of thing I'd have done - and then proceeded to record the memory as mine, even going as far as attaching it to a specific shop from the same chain in the story.