It's bad to try to cheat at cards.
James is playing poker with some friends after work.
James wants to win enough money to buy a new pair of shoes.
James plays a fair game of poke.
James hides an Ace in his sleeve and switches it with a card in his hand, giving him 4 of a kind.
He wins more than enough money to buy his new shoes and gets invited to play again next week.
One of the other players thinks he saw James cheating and bans him from any future poker games.