This is a bit of a simple one but familiar to everyone. Supermarket blockades. When I'm in the supermarket, I always keep my cart off to one side or the other. Why do I do this? because some people don't. They park that thing right in the middle and wander off. Now you have to move their cart, or say excuse me. Simple, but totally unnecessary. The worst is when someone has their cart off to the side and someone parks theirs right next to it. Right smack dab next to it for God's sake. Why? I don't know the answer. But I reckon it has something to do with somebody being just plain dumb.