Inconsiderate People in the Grocery Store

Why is it that the fattest ass in the grocery store has their cart in the right of the aisle and then stands next to it on the left of the aisle taking up the entire aisle. Apparently, they have no peripheral vision as you can stand right in front of them and they will not move. This is when I go in to my ventriloquist mode. I will bend down and look at an item and without moving my lips I say, "why don't you move your fat ass out of the way". Then of course I look around like, "who said that?".