A Ukrainian inventor, Johan De Broyer has created an idea for a re-sealable aluminum soda can which 
features hidden advertising messaging. The ingenious new can appears like a standard soda can -- until it is popped open.
When the tab is turned 180 degrees, the can becomes re-closed with a water-tight and gas-tight seal, revealing a full-color, high-resolution advertising message through the tab opening.
I think this is the one we call “thinking out of the box”, for the amount of soda cans that are consumed worldwide this is not a bad idea at all to use it as a communication tool.
Also a very important fact that u need not drink the whole soda at once.
Press release :Advercan