This one occurred to me the other day while playing online poker:
SCENE: A SUBURBAN LOUNGE. WE SEE A SMALL CHILD PLAYING CHESS. HE MAKES HIS OPENING MOVE. WE THEN SEE THE POKER PLAYER: A COMIC-BOOK TEXAN REPLETE WITH HAT, SHADES AND OTHER PARAPHERNALIA. CHEWING THOUGHFULLY ON A TOOTHPICK, HE SCOOPS HIS HANDS FORWARD AND GATHERS ALL HIS PIECES, PUSHING THEM TO THE CENTRE OF THE BOARD. HE LEANS BACK.
THE POKER PLAYER:
Your move.
REACTION FROM THE CHILD.
ENDS
Perhaps this is only funny if you play poker. Not so funny on its own, but would be a recurring sketch, with the character playing different games in different situations, (e.g. Monopoly) each time shoving his pieces into the middle and saying 'your move'. Later sketches may feature responses from other characters.