An employee asks his co-worker for small change

— John, do you have two tens for a twenty?
— I have a ten and two fives. Will that work?
— Yes, thank you. I'm taking my car for an emissions inspection during lunch hour, and they always want the exact amount.
— I know, that's annoying. I took my car for an emissions inspection last year, and all I had was a twenty. I had to walk to a bank machine and come back!