Doppelgangers
As we drove home from my primary school one day in 1979, I saw my older self walking up the road in the opposite direction.1 They didn't see me, so I've no way to tell when it was.
My parents, coming to visit, saw me in a service station on the M6; I looked straight through them, and though they followed me and called my name, I refused to acknowledge them. I was 50 miles away, at home.
I once attended (and participated in) the Abbots Bromley Horn Dance. I thought I was pretty clever in my choice of T-shirt, which had horns on it, and looking round, no one else had one. Someone sent me a photo of me dancing with the horns, only I wasn't in the photo, and looking directly into the camera from the far side of the dance was someone else, dressed exactly like me, but with a different face.
4 July 1978; 7 Aug 2010; 1 Jan 1065
Notes:
1 I didn't die. Yet.