When one starts playing computer solitaire (or any variation played on the computer) and is unable to stop playing until they have won. Most frustrating when you cannot win. Also equally frustrating when you have won and you want to win more causing a continuous cycle or loop.
Mom: Johnny, dinner's ready!
Johnny: I can't come down yet, I'm stuck in a solitaire loop!
Person 1: Hey how come you aren't responding to my message?
Person 2: Sorry I'm stuck in a solitaire loop.
Flipping through the deck over and over while playing the card game Solitaire even though there are no more moves available, denying that you have lost even though you already know it.
Guy #1: Dude, you've gone through the deck 3 times already. Give it up, you've lost.
Guy #2: ...So I have. I'm in solitaire denial again.
Quite possibly the greatest game created by man. Can be played alone, which is absolutely badass. It's also pretty much the only thing a person does in computer class. Also when you beat it, the cards fly around like, fucking crazy ass birds!