I really like this poster. The shadow of the hand and cigarette appears to be a hand holding a gun. It would look even better with smoke coming out of the cigarette, making it look like the gun was just fired.
Heinz ketchup poster - in this poster, designer put the stalk of tomato on top of the ketchup bottle to represent tomato. Designer used just two elements(ketchup bottle and tomato top) but now it show new aspect from that. It's simple but smart.