Shopping Cart Key

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Can't recall ever visiting anywhere where they locked up their shopping carts.
I did stop at a mall once in Spain there they validated my parking ticket with my purchase slip so I got free parking.

Throughout the midwest is a grocery chain from Germany called Aldi, the brother of this Aldi chain owner has Trader Joe stores throughout the USA.
Aldi requires you to insert a quarter to unplug the cart from the carts in a long row near the doors. The idea is you have to put the carts back to get your quarter. This keeps them from being walked off with by the homeless as well the parking is not strewn about with carts. It really is a great idea. Now I did return a cart once to find it had a Filipino 2 cent peso which is the exact same size as a USA quarter.