This is a story which is perfectly logical to all males:

..A wife asks her husband, "Could you please go shopping for me and buy one carton of milk.

..And if they have avocados, get 6."

..A short time later the husband comes back with 6 cartons of milk.

..The wife asks him, "Why did you buy 6 cartons of milk?" He replied, "They had avocados."

....(If you're female, I'm sure you're going back to read it again! Males will get it the first time.)