When we want to remember something, we usually tell other people that we were there. However, more people need proof. Anyone could have said they were at the MLB All Star Game yesterday. When someone says something like that, the other person needs to have some kind of proof.
I was at the All Star Game yesterday, but not everyone is going to believe I was there. There are some things that just sound too good to be true, and those are the things that are harder to believe.