I do usually crack my joints when there is a slight pressure there. Sometimes that is the only time I can actually crack those joints–like elbows, back, knees. I can crack my toes and sometimes my fingers just because though. But I also when cracking my toes, feel a slight burning sensation afterwards, but it is alright with me since is kinda feels good. I also do have alot of stretchability in my toes.

I can crack:
my elbows
my fingers (multiple ways)
my knees
my ankles
my neck (rarely)
my back and jaw (rarely)
and my toes (most often).

I rarely crack my neck,and I actually dislike to do it anyways because it feels like I might snap my neck. My back and my jaw do not really like to crack and snap, but they sometimes do. My fav though is my toes, I do not know why, but I like to crack them and I can do so constantly.