Returning your shopping cart when you're done shopping. Just do it people!

Aldi requires a quarter to use a shopping cart. If you don't return your cart, someone else probably will for a quarter per cart.

Those small rewards don’t really work.

At the mall, I will rent a kid’s cart (often shaped like a car) for $9. You get a dollar back if you return it. However, instead of returning it, I usually find a family with small kids coming into the mall and ask if they want the cart.

Well, isn't that just returning it with extra steps and you paying a dollar more than you had to?