I return the cart because you have to put a coin in them and I'm Dutch so :idont
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Also I worked in a super market and remember the hassle of gathering all the shopping baskets and carts dropped on the street by heretics
Return the cart, always.
...unless I see someone that's double parked, then I get a running start and rocket the cart into the fucker's car
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jk, but other people who aren't afraid of going to jail or being shot by double parking assholes should totally do that