Than's Cart

We have recently found a great, cheap grocery store that we are now going to regularly and they happen to have a shopping cart with a car in front (like in this picture). Now, every time we go Than insists on using that cart--even if we're only getting milk. Last time we couldn't find the cart and as we were leaving we noticed someone bringing it in and using it. Than of course, started to chase after it and cry, not understanding that we had to go and it was someone else's turn to use it. Thus, it is officially HIS cart.