Cart tipping

I went to Wal-Mart tonight with some friends. It was a nice adventure. My friends are getting married this summer and we were shopping for supplies. After loading our treasures into the car, my friend tipped the cart onto its side. Why, I asked, would you tip the cart on its side? Well, he replied, if you aren't inclined to return your cart to a designated collection point, you should have the decency to tip the cart onto its side so it doesn't crash into parked vehicles. After thinking about it it is an interesting concept that makes a lot of sense, if you ask me.