I’m only 15. I went into a local sandwich shop where you order at one counter, they make your sandwich, then you pay at another counter. I grabbed a drink and chips as well and did the math in my head, happy I had enough money. Well, being a stupid 15 year old, I forgot tax was a thing. My total came out to exactly $12.01. I had $12. The lady gestured to the take a penny leave a penny but it was empty. I started to ask if it mattered but I guess she realized what I was about to ask and told me to go put something back, along with a disapproving look. It was only one penny. AITA? 