A friend dropped his passport in the back of taxi in Hanoi and the hostel manager where he was staying spent two days 'chasing' it all over Hanoi to find it for him, and then wouldn't accept any money as a "thank you".
Also in Hanoi, another friend dropped her purse in the street and a few hours later when she realised that she had lost it a random Vietnamese woman handed it to her.
Two true stories that help me remember that not everybody in this world is an arsehole!