There are some things in the world which can't be bought for money. They are friendship and love, family and, of course, happiness. But some of them can be easily sold provided that someone offered you enough money. How is that possible? Easily! Just imagine that you have a dog who you consider to be your best friend when suddenly a random person in the street askes you to sell him the dog for an enormous sum of money. So would you rather keep the dog as a friend or sell it?