I popped into our 7-11 one early morning because we were out of milk. The one in the front of the shelf had an expiration date of that day, the one behind it was two weeks later, so I pulled the old one out, grabbed the newer one, replaced the older one, and the store owner came around the corner and started yelling at me for taking the newer milk. And by 'yelling,' I genuinely mean he was yelling at me about this. I explained the expiration date, but he didn't care...he just kept yelling at me.
I told him "sell me this or sell me nothing," he relented and I never went back.
Oh, and there was a time when I could only afford a 7-11 hotdog for lunch, but 35 years later, every once in a while, I burp and can still taste it.