This Iranian lady came in the other day and put a bunch of coins on the  counter to pay for a bar of chocolate.  I noticed one of the coins was a  foreign coin and worthless here.  I gave it back  to her and asked her why did she want to eat away my profit on this bar. I need to make a living and will go out of business if everyone pulled this  crap on me.  My profit is only pennies on each item.  She looked right at my face and said don't be so cheap, it is only a dime, besides, someone did it to me  so I did it to you. She gathered all her coins and returned the bar and walked  out. See what I have to put up with? Just to pay the rent and put food on the  table.