It was recorded that Curt walked out of the room after foreseeing his demise in the Hasting chess tournament in 1895.
Some say walking out due to noisy spectator was still polite enough, but to make Steinitz wait for the remaining time on CvB's clock to end in order to claim victory, is rude enough.
Impressive move at move 22. Rxe7! of the game. Too bad Steinitz had to turn insane (claiming he could beat God in chess) and left his family poor.
1 e4 e5 2 Nf3 Nc6 3 Bc4 Bc5 4 c3 Nf6 5 d4 exd4 6 cxd4 Bb4+ 7 Nc3 d5 8 exd5 Nxd5 9 O-O Be6 10 Bg5 Be7 11 Bxd5 Bxd5 12 Nxd5 Qxd5 13 Bxe7 Nxe7 14 Re1 f6 15 Qe2 Qd7 16 Rac1 c6 17 d5 cxd5 18 Nd4 Kf7 19 Ne6 Rhc8 20 Qg4 g6 21 Ng5+ Ke8 22 Rxe7+ Kf8 23 Rf7+ Kg8 24 Rg7+ Kh8 25 Rxh7+ (CvB walked out)