Reddit has answered this for me: Also other websites. I also managed to do it myself. 'It's some kind of gestural tick that psyches them for battle. Kaneki started doing as a result of Yamori always doing it when he was torturing him, and Yamori picked it up from the human investigator who tortured him.

Jul 17, 2016  Kaneki vs jason Jason flys backwards kaneki puts on a cool face and trys to crack his fingers like he had always done. They didn't crack,he tryed again. Kaneki and Yamori from tokyo ghoul crack their fingers really cool. I want to crack mine like them but I can't get them to crack when I do. Like is there some sort of trick to it? I just can't seem to get my fingers to crack.

Naki also does it, on a different finger as a tribute and to mimic Yamori.' Source: Reddit user: “ Cracks Finger” is a gestural Tic shown by Ken Kaneki, Naki, and Yamori. It's a habit started by Yamori's torturer, then imitated by Yamori, Naki, and Kaneki. In the anime “Tokyo Ghoul”, Yamori cracks his finger every time he tortures Ken Kaneki. This teaches him to crack his own fingers after his escape. I didn't want to do this but here (Text below reddit post): Image found here: An actual video of someone doing it.

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