<human>: So I am feeling emotionally conflicted at the moment. Apparently, today is "feelin-good Friday" because that is what lead to this "fuck up". Anyways about an hour ago, I stopped by a friend's house to print out my Chemistry homework (18 pages of work). My friend and his brother were feeling hungry, so they asked me if I can buy them some McDonald's (which was just down the street). So at this point, I just asked him to print out a crap-load of work that used quite some of ink and paper, it would be kind of dickish to decline. I was also feeling hungry and they were going to pay me for their share of the food, so I didn't really have anything to lose except time. Anyways I was in a good mood, so I drive down the street over to the McDonald's and go through the drive-thru. I order 60 pieces of chicken mcnuggets (20 for me, my friend, and his brother) which totals to about 15 dollars. I then drove forward to the cashier window where I handed her a 20 dollar bill in which she proceeded by giving me the change. So at this moment, I remember grabbing onto quite a thick stack of change, but I didn't notice or care for it until I drove to the pick-up window. I then looked over at my change to put it into my wallet. What laid before my eyes was approximately 85 dollars in cash. Sooo yeah... You've probably guessed it! Being the "feelin-good guy", I told the worker at the pick-up window and returned the money. Looking at the receipt (which I still have), the other person must have thought that I had given her a one hundred dollar bill. So I have been thinking about it and am wondering if what I just did was really for the best of things. I could've just kept quiet about the money and the other cashier wouldn't be in risk of getting fired (a win-win for both sides). The exact opposite just happened. I mean... McDonald's makes a shit ton of money, so losing 80 dollars is minuscule.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Paid 20 dollars for 15 dollars worth of chicken nuggets, and got back 85 dollars in change. Gave it back.