I worked in a retail store with a woman that learned Spanish from her Mexican grandmother although she did not inherit the appearance. Regina loved to mess with the Mexican shoplifting teams that would hit us.
One "shopper" would be the lookout while the other would stuff goodies away. The looker would be saying, " go ahead, no one is looking" and Regina would say in perfect Spanish, " no, I don't think it is a good time.....". They would drop the goods and run out the door.
I must not be too observant but I've only recently noticed in several stores how our friends from south of the border help themselves to all kinds of things from food to diapers to milk. I walked down the candy aisle in Wal-Mart just before Valentines and they had some Easter candy out as well. A whole Mexican family, adult and children, were munching on those individually wrapped cream filled easter eggs. At Sam's an employee was complaining about an open container of milk. He told me they just help themselves to it--pour what they need into the baby bottle and they are on there way--same thing with diapers.