It's bad to cheat at games.
William is hanging out at home with some of his friends, playing a card game.
William wants to win the game.
William spends time analyzing his friends' moves as well as the cards that have been played, and uses this information to make a smart decision which wins him the game.
William takes a quick glance at his friend's card when she isn't paying attention and uses this information to win the game.
Williams friends are impressed with his performance and ask him for some tips on how to play the game better.
Based on his behavior, William's friends suspect that he cheated in order to win and refuse to play any more games with him.