The shopping cart. What a great tool to have while in the grocery store or department store. I used one today at the grocery store and when I was done with it I waited near the cart return for FOUR people to walk 8-10 steps further than I was to get their very own cart to borrow while they shopped. I guess the cart I was attempting to put back was just not up to par. It seemed it would have been so much easier to just take the one I was going to return. I guess I have cooties.