When I play with my friend, he will often knock his own king over when he is going to lose.
He ends the game and says, "I lose".
Is this permissible?
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here is a link addressing this question exactly i quote:
It depends on the way you do it, generally it's not rude, though.
Once I was playing a tough game against the late GM Wojo, and got a balanced and complicated position, but also considerable time pressure. After the time pressure was over I realized that I have totally blown up my position, played 41.Kg1-g0 and pressed the clock. Wojo was surprised at first, but later he had a good laugh.