About five or six years ago I took a photograph of myself sitting on my bed, to send to a penfriend. I live in a different house now, but I remember my old house well. I came across the photograph recently and I noticed a big poster on the wall behind me with some dolphins on it. The weird thing is I have absolutely no memory of the poster. All the other things in the picture are familiar. I'm not a forgetful person and I'm quite freaked out by the fact that I could have had a big poster on my wall, right next to my bed and now I can't remember it at all.