I saw this asked on another instance, thought I’d ask it here and I’ll post my response from there in the comments as I think it felt cathartic.
Doesn't need to be a life or death situation, just any moment in your life where you found yourself saying "Holy shit, I can't believe this is happening!"
Witnessing someone's bad trip. A very, very, very bad trip. The kind of incident with a "before" and an "after". Worse is that it was completely avoidable, had I been a little more concerned about others, rather than myself. I can never forgive myself for what happened that day..
Although I don’t know the details of what entailed on the night, I do believe that people should forgive but don’t forget as holding on to things like that isn’t good for you and this applies to forgiving yourself, but not forgetting so that you don’t make the same mistake again.