This came from personal experience, very recent in fact (today).
After fulfilling the large shopping list in hand, with both kids in tow, we managed to get back to the car in one piece.
Got one kid in the car.
Got the second kid in the car.
Time to start unloading the massive cart, but...
WHERE'S THE CART?!
For a split second I thought I was completely losing it. How did I get to the car with two kids and no cart? That's when I heard the rattling noise and saw my newly purchased storage bins and
And that's when the sprinting ability kicked in and anyone who may have been around saw this woman making a mad dash for a runaway cart, which was, in fact, seconds away from hitting a car.
Yeah, just what I need. Another random bill to pay.
Anywho, all that to say...listen up, Wal-Mart. Some of us moms might appreciate brakes on your carts. It could lead to fewer parking lot accidents, less I-just-ran-the-cart-into-the-back-of-Mom's-legs incidents, and a possible decrease in our blood pressure.
Just a thought.