A Combo Of Apologies And Sugar

I place an order at a burger place and I use a coupon. The guy at the register enters it and he finishes off.

Cashier: “All right, your total is $7.49.”

Me: *Pauses* “No, it should be six bucks, plus tax.”

Cashier: “Yes, but—”

Me: “Wait, did I screw up the coupon? Or did it not go in right?”

Cashier: “No, it went in b—”

Me: “Then why is it a dollar more?!”

Cashier: “Because you upgraded to the large combo, sir. It’s six dollars for the small.”

I stare into space, gears slowly grinding to life in my brain.

Me: “I’m sorry. I swear I’m not usually this stupid. Your soda machines are free refills, right? I think I need a lot of sugar and caffeine right now. I’m really sorry.”

Thankfully, the cashier got a bit of a laugh out of that and there were no hard feelings. I still apologized again, and after sitting down to eat and, yes, getting the sugariest and most caffeinated thing they had, was thinking much more clearly.