My son has been working at a grocery store . . . as the guy who brings the carts back into the store. (He does a lot of other stuff, too.)
As a result, I have become so aware of how many shopping carts are left all over the parking lot. It's a big job to gather them all. (This particular parking lot does not have any of those 'cart return' things, so people just randomly leave them everywhere rather than bringing them back to the store.)
So . . . tell me, do you return your shopping cart? Or do you just abandon it in the parking lot?