Answers

Talking about the answer again.
This is happened today.

I was on the train, i was standing on the window side, there was a lady standing in front of me.
She was almost sleeping standing.
And she dropped her train ticket.
I think i saw she dropped, but she doesn't know, she's still sleeping.

Ok there's what should i do.
Should i tell her she dropped?
yes, it seems the rightest answer.
But there's more materials here.
She's sleeping. Should i or shouldn't i wake her up?
She might be surprised if i wake her up.
Maybe she thinks like what the hell this girl want from me.
I looked around, nobody cares about the ticket. And i think this way.
did i actually see she dropped? Is this really hers?
But there's still a ticket on the floor.
I'm getting be confused. Because i'm not confidentally saw. And i'm afraid of being looked silly.

Time over.

It took too much time to make a motion.
I went to think this way.
Maybe i didn't see it. It didn't happen.
Maybe it happened but apparently it seems it didn't. Because nobody cares about it. The right answer should be doing nothing in this case. Its too late anyway.

And i was imagining she loose her ticket and have to buy another one at the station..

Train arrived at the next station, she woke up. And the man standing next to me, he just pointed at the ticket to her!

She realized that she dropped it, and said thanks to him and got off the train.

Oh my god.
How smart! So neat!

The man next to me, he didn't loose the fact i lost. Which is 'she dropped? Or she didn't'
He kept the fact until she wakes up. So he didn't' need to bother her sleeping and make her freak out.

Everything is so perfect. I'm impressed.