I can’t stand seeing stores with their doors wide open on a 90 degree day. If I’m not in a rush, I’ll try to close them, just for fun. If a clerk sees me, I’ll just innocently say, “Oh, I thought it was a mistake so I was trying to help you out. It’s much cooler in here than it is outside. I figured you weren’t wasting energy and money on purpose.” Anyway, check out the link above.