The joints in your fingers  are the easiest ones to crack, but many people also crack the joints between vertebrae in their neck and back, and even their hips, wrists,  shoulders and so on.
Stawy w palcach najłatwiej złamać, ale można też złamać stawy między kręgami szyi i pleców, a także bioder, nadgarstków,  ramion i tak dalej.