Man Logic

A wife asked her husband to go to the store.
Please buy just what I want and nothing more.
Just a carton of milk and if there’s avocados six.
I need the milk for tomorrow to put in my mix.
—
The husband was back soon, didn’t take him long.
The wife couldn’t believe that he got it all wrong.
Six cartons of milk he bought, so what did he say?
You told me to get six if they had avocados today.