It's bad to freeload off your friends.
Jack is a college student.
Jack wants to go out with friends.
Jack goes to a concert with friends and brings everyone a beer.
Jack goes to a bar with friends, drinks a lot, and says he forgot his wallet again.
Jack's friends appreciate it and pay him back, and they all have friend at the concert and agree to see that band again.
Jack's friends stop inviting him along knowing he won't pay for himself, and he's left alone.