That is why you guys need a system like our money.

You would never mistake $1 for $20 because we have $1 coins and $20 bills are green. $5 bills are blue, $10 bills are purple, $50's red and $100's brown....... and ya'll can make fun of us for our monopoly money all you want...... LOL

Seriously though that sucks, but like others have said you have a credit of $20 worth of karma