Never take the shopping cart off to the side of a row of stacked carts. It may look like a regular cart. It may hold your groceries like a regular cart. But once you push it as far as the dairy section, that motherfucker will... A) Start squeaking like the pet rat you tied to your rearview mirror. B) Begin a one-wheel wobble enough to make you seasick. C) Find whatever someone else dropped and lock it under the goddamn wheel. It's a dangerous world out there. Be very, very careful.