sister: I win!Then the brother - frustrated - would let all the checkers fall to the table in a red and black crescendo worthy of Stendahl.
brother: where, I don't see it
sister: see, here...diagonally
brother: pretty sneaky, sis!
Now my son is in a "Connect Four" phase. But at five, the concept of diagonal is on a par with astrophysics. Again and again I get to relive that commercial. Except my son, rather than being impressed by my cleverness, is simply bewildered. He does enjoy watching the checkers crash.