Matthew plays a trick

Matthew is playing outside in the snow.  I have come inside from shoveling.

Ding-dong!  I answer the door.  It's Matthew.

"Daddy, the mail is here.  Can you get it?"

"Is it snow in the mailbox?"  I saw him stuffing snow in with his friends before I came in.

"No.  It's mail.  Can you get it?  I can't with my gloves on."

"Son, is it really mail, or just snow?"

"It's snow."  He grins at his cleverness.  "I play a trick on you, Daddy."