It's for anything my mind finds important.
For example reciting vows on my wedding day, when I was in a car accident I thought would be fatal, the day my wife left and the preceding argument. Childhood trauma stuff, like watching my mom get severely beaten various times. My mom dated a guy that used to psychologically torture me and who knows what else really. I have some scary memories that just end in a black hole. If I try to probe those any further I get crazy panic attacks. The last time I saw my cousin, who was like a sister to me. Coming home from visiting my grandparents on a greyhound bus, I read an obituary for my father on the way home and that's how I found out he died. I remember getting off the bus and my mom had an About To Deliver Bad News face. The time a bunch of cops pulled guns on me and I thought I was going to die. Lots of other stuff.