A client has had me working for them on a job for over a year and a half now and been a nightmare the entire time. I sent them a bill for expanded scope.
Client: This is not the amount we agreed to! You overcharged us... I am going to be generous, given the hard time you are going through and only request a refund of $901.28, even though the balance is actually much higher. I have sent you a PayPal invoice to pay me back with. Please pay at your earliest convenience.
First time a client has ever asked me to pay them back for work I did.