Hockey and Five Year Olds

Driving home from the gym last Friday...

Mason: "Will daddy be home when we get there?"
Mom: "I don't know, he is going to a hockey game so he may have left already."
Mason: "How do you play hockey?"
Mom: "Players on ice skates hit the hockey puck with sticks and try to score goals."
Mason: "So, its OK to say hockey puck?"
Mom: "Yes, of course." {{??????}}
Mason: "But its not OK just to yell 'PUCK!' Mrs. Shulan told us that."
Mom: {{stunned & trying not to laugh}}