From the clever mind of Max Maven we had:

Pocket Rocket - pic of rocket, four cards counting down 4,3,2,1 - picture card has changed - now of rocket lifting off - then came

Lemonstration - pic of Lemon - five cards, splelling L E M O N - annagram - swop the L and M around - now spelling MELON - picture card has changed - now of a Melon

I have come up with a variation, called

Black and White - this uses 2 packets of cards

The first packet : shows a white (blank) card, with five cards spelling W H I T E

The second packet : shows a black card, ( color a blank card black) with five cards spelling B L A C K

Swop the black and white cards around - and presto, they have restored to their original position.

Hope you like it!