Forgetting

I can feel the difference...
The difference when seeing things between two events
Before and After
How significant would it be
Once the things happen

The reason I wrote it, because, after it happen, things I saw after that different from what I would see before
Twisted, isn't it?

For example, before it, I find that the things are amusing, I guess that's what wrong,
Why would I feel amusing for something to be sorrowful
How heartless was I last time to interpret that way

Now, I cannot find it amusing
I find it sad to be that way
I forget how to be amused

I guess that's what went wrong

Hint-so that I won't forget, Gan.