Hi, Poptastic,
Great question. I think about popping my neck when I am at work All. The. Time. Luckily, I have my own office so I can get away with popping whenever I want to. When I'm at home, I don't care so much about the neck but I move on to thinking about the back–and I'll pester my boyfriend from the minute we get home until he cracks my back. It doesn't even feel that great or wonderful afterwards--it is just that anticipation!
I always think my neck crack is the loudest–but I'll always turn to my fiancee and say, "Can you believe how loud that was?" and he'll always look at me like I'm raving bonkers.
So instead I'd have to say my elbow.
I pop my sternum in the other way–I pull my shoulders together towards my nose and it pops. But it has to be the first thing in the morning or it's just a nice back stretch.
(First time poster)
I started my cracking journey with the elbow–I had been running in a parking lot and fell right on my elbow and had it in a cast forever and then when I was able to move it, it made the most lovely pop. Now I do it all the time also.