A story : I entered a bar and one of the girls whom I knew a long time but never asked me for a drink and I never bought her one asked me for a drink this time. I knew she needed money because she was building a house and this was going stepwise, when there was no money the work was stopped. I asked her, how much is a drink ; 150 baht, how much is in it for you ; 50 baht. So when I give you 100 baht we both make a profit of 50 baht right ? It took her some time to figure this out but in the end she agreed and her big smile was like a reward to me.