I think Grocery stores should invest more money on keeping their carts in working order.
There is nothing more frustrating than trying to manhandle a grocery cart - especially when it is full of food.
We have these things at the grocery stores where you have to put in a quarter or a loonie in order to get your cart, and then put it back to get your money back. I know the stores do it so that carts aren't left all over the place - or taken away, but it is seriously a pain when you have to dig through the wallet to get change (not all stores use the same denomination so sometimes you get to the line of carts with a loonie and what you really needed was a quarter..) then once you get your cart it is a piece of trash.
I know the stores don't make money from grocery carts and it is a service provided for convenience. I just think if you are going to provide something that is supposed to be convenient then please MAKE it convenient! Trying to push a cart through the store with a child in it, and then full of groceries should only have to take ONE person to steer, not one person pushing and one person pulling and having to request total strangers help in turning down the aisle because you can't get the sucker to turn... and don't get me started on stores with aisles that don't fit one cart, let alone a cart going in each direction!