I ALWAYS return my cart, either right back into the store, or to the designated cart return space. I also take a cart from near or around my car to take INTO the store. This prevents me from having to go back outside in the event there aren't any inside, due to lack of employees bringing them inside. Even if I won't be needing to use a cart, I take it inside for the same reason. I find it so RIDICULOUS to see people walk right past a cart. What is the harm in taking one inside---you're going there anyway!