handled the same day. You couldn't ride past the quick stop and break a $20, go back home, hand him a $10, and ask him for one of your $20's back?

Did you agree on the price beforehand? Why not get the exact amount from jump?

Either way, letting it go on this long has default put you in the asshole position since it's not a lot of money, so just go ahead and be an asshole about it.

"All the world's a stage,
And all the men and women merely players:
They have their exits and their entrances;
And one man in his time plays many parts..." -The Bard