I don’t know whether this is exactly what you want but I will try anyway… There was one time when I got drunk (well really there were many but…), and I couldn’t remember at all what had happened the night before when I woke up the next morning. Some of my friends started telling me that I had done various things, some of which I hadn’t, and I ended up getting really angry because I couldn’t accept that something I had no memory of might have happened. Anyway when I had time to think about it I could picture myself doing those things but couldn’t distinguish whether those things were memory or imagination from what my friends had told me. I still don’t know to this day.