To help a friend lose weight, I told her that she should switch to lower-fat foods like skim milk.
She said her family would only drink whole milk, so I suggested she keep their regular container and refill it with skim milk.
This worked for quite a while until one morning her daughter asked whether the milk was OK.
-“Sure, it’s fine,” my friend answered, fearing she had been found out. “Why do you ask?”
-“Because according to the carton,” the daughter explained, “this milk expired two years ago.”