Especially around the researchers at the Dynamic Test Center in Sweden. Popular Mechanics shares a video of what would happen to your groceries if your cart happened to reach the speed of 73 mph and crashed into a wall. Spoiler: No mixing required.
The first part of the video shows what happens if a cart hits your car at about 12 mph -- the groceries in the cart are protected, but your car has a good-sized dent and may even wind up with a broken window if the cart hits near your door.
Although the interstate-speed cart crash is not very likely, the possibility that a cart gets a good running start and bops into your wheels at jogging speed is not small -- especially when we consider how many people view their responsibilities when it comes to cart storage and return (Items 2, 3 and 4 on the list).