One of my biggest pet peeves is when people are too lazy to put their shopping carts in the cart bins (or whatever they're called) in the parking lot or take the cart back to the store. Seriously, it's not that hard. The most frustrating part is that those same people are probably the same ones who get really ticked if their car is the one that the wind blows a cart into.
So seriously, the next time you go grocery shopping. Walk your cart to where you're supposed to if for no reason other than to be thankful that God blessed you with the ability to actually walk to do so.