About 10 years ago I was out shopping with some people. While we were walking around, I thought I saw something small and dark drop from one of them. It was from the corner of my eye so didn't see properly and couldn't see it on the floor. It was very busy, loads of people and thought it could have been anything. So I forgot about it.

Then the next day this person said they had lost something. A small object which could have been what I saw drop. I then felt really bad, was conviced it was that, but never saw anything.

I tried to make excuses to myself:
- This person was quite scatterbrained and could have lost the object anywhere
- What I saw could have been anything
- It wasn't on the floor so it must have got kicked away very quickly
- Even if I had known, could I have done anything? It was very busy and it could have been kicked a long way away in any direction, impossible to find

Still feel bad now really. They never did find that thing. So I've convinced myself that it was that I saw.

I have to forgive myself because I really didn't know and it's over now and in the past. There's nothing I can do about it.