In this experiment, they've asked for food from two people separately and their response is a mere no because they're hungry too.
Meanwhile, they gave a box with extra slices of pizza to a homeless man and the man gladly accepted it. After 20 minutes, a guy walked and sit by the homeless man on the side walk and said that he was hungry. He never hesitated to give that extra slice of pizza to the stranger. He never expected what he will get back in return because of his generosity and that event made him so emotional.
The thing we get in life can make us a living...The things we give to people can make a life and never look down on anybody unless you're helping them up.