What has made, or would make you justifiably forfeit a match, or pause to take a breather?

We've all done it at some point in BGs. If I've had dropped inputs that cause me to unfairly catch a combo and lose health, a "missed" hit that actually made contact with the defender, stubborn AI holding on to it's special, or waiting for the agonizing clock to tick down at the end of a fight, I just might go ahead and forfeit.
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At that point I don’t have the mindset “oh well, it’s a loss, let’s at least try to learn something” - I just forfeit and go do something else.