I lent a coworker $10 one day last week. For some strange reason, he only got 20s when he withdrew money from the ATM to pay me back. It wasn’t a big deal since I had some errands to run at lunch including stopping by the bank. To make a long story short, I gave him a five dollar bill and 5 one dollar bills when I made change at which point he got kinda snippy that I didn’t give him back a 10 dollar bill. I was flabbergasted that he was complaining; especially since I was the one who lent HIM money in the first place. If it was so important to him, why didn’t HE just get correct change to pay me back? You would have thought HE was the person doing the favor. Lesson learned.