Egg & Cheese please

I go to the coffee shop to get my usual egg and cheese sandwich that I always get during my break at work (=in between massage appointments).

The coffee guy behind the counter says:
- "Hey, you didn't pay for your sandwich last time you were here!"
- "Really, I didn't...?"
- "No, I remember now, now that I see your face and all, you didn't pay last time."
- "Oh, I'm so sorry... let me pay for it now then, I can't remember what happened last time."

And then the coffee guy tells me not to worry about it - "it's fine" - and I think: "cool, that means I got a free sandwich." But then I see the grumpy look on his face and he says "you know, I shouldn't even have mentioned it, since I'm not even gonna charge you" so I say:
"hey, I have a twenty right here, just charge me twice for the sandwich I'm getting now." And he does.

As I sit down to eat I'm thinking it's good that we sorted that out; I don't want to be remembered as the girl who didn't pay for her food, especially since I go there every week. But then I'm thinking, what if this dude is wrong? Maybe I DID pay him and he was just spacing out at the time...

Inevitably, I have to think of him as the guy who charged me twice for a stupid sandwich.