For some reason my wife likes taking more time there than other places we shop for food, and I get anxious to get it over with. You can bet most of the times I wander off to get things off our list that she's herself wandered off, and the Costco we go to doesn't have good cell coverage. So I then end up both anxious about spending all day shopping, and annoyed that I can't find my wife.
I am sure I'm not the only one. I try to go alone, or stay in the car this happens so often.