As if kids needed another tool in their arsenal of getting what they want at a toy store, a French chain created this incredibly clever shopping bag featuring kids' faces that go from frowns to smiles when the bag is filled.

Designed by Joupi's ad agency, the bag subliminally guilts parents into buying whatever their kids want at the chain's toy stores using a simple sliding mechanism like you'd find in an interactive pop-up book. After all, what parent can bear to even imagine their son or daughter frowning in disappointment at not getting what they want? We like it because it's subtler than a temper tantrum, and its passive approach means that new action figure doesn't cost you an hour of time out when you get home. [Ads of the World via Walyou]