Stop in for a cup of coffee

Couple of years ago I was in the grocery store buying groceries, like I do once a week. When I get to the checkout, the clerk asked me do I want a paper sack or a plastic sack? I replied, I don't care, I am Bisacktual !!!!. Everybody around me fell out.
Kind of like when the lady asked me if I wanted my milk in a bag, I said no, I prefer it to be left in the jug