Eucharistia (eu-cha-ris’-ti-a): Giving thanks for a benefit received, sometimes adding one’s inability to repay.
X: Thank you so much for the new lawnmower! There’s no way I can repay you.
Y: If that’s the case I’m taking it back. I was expecting you to mow my lawn once a week without fail.
X: Then, take your damn lawnmower back! What do I look like, your indentured servant?
Definition courtesy of “Silva Rhetoricae” (rhetoric.byu.edu)