1.   Between moves he cracked his knuckles.

2.   Dennis put his glass down and cracked his knuckles dramatically.

3.   Dennis rubbed his hands together and cracked his knuckles.

4.   He sighed a lot, stretched his legs, cracked his knuckles.

5.   It felt like he was cracking a knuckle.

6.   Karma Rubbish smokes at the end of the garden, cracking its knuckles to pass the time.

7.   Tom was trembling, sitting on the edge of a chair cracking his knuckles.

8.   Wishart rubbed his hands together, cracking his knuckles as he tried to control his anger.

9.   Just cracked my knuckles rather as well.

10.   Crack the knuckle and extract the meat, discarding the shell.