(n.): The sudden loss of motivation and satisfaction that occurs when someone else asks you to complete a task you've been meaning to do, just as you're about to start it. This results in the loss of personal credit and a sense of accomplishment, as if the other person has taken away your opportunity to showcase your initiative and independence.
I’m so pissed at my wife. Just as I was about to unload the dishwasher on my own she asked if I can unload the dishwasher. Total stolen dopamine situation!