While sitting at the desk at work (I'm a programmer), particularly the next day or two after playing racquetball, at any given stiff time of the day (my back, that is), I do these all-in-one motions where I do the 'ole bend the head to the left side to get the neck to crack then roll my head to the front (center position) which gets the very top of the spine to crack then twist to the right and twist my lower hip forward and to the left and kind of let off a continuious domino-falling cracking effect right down my spine to the tail bone. It's a pretty intense moment 
. But on these post-racquetball days, I seem to do that quite a few times throughout the day.
And, yes, I do get the BOOM neck cracks. It's like a much lower frequency than those high treble-sounding little cracks. Very intense. Very relieving. Ahhh. I still don't believe my physique has been negatively affected by this 20-year plus habit.