I like cracking my tailbone once in a while. I sit on a ground with my arms around my bent knees and put a slight pressure on my tailbone. ‘crack!’ says my tailbone and (x) goes ‘ah..”
It really feels good. I can’t crack my nuckles or necks but I can crack my tailbone (and my foot bones and thigh bones) and I get the same relief as other people would when they crack other parts of their bodies.

Off to a symphonic band practice.. and I have no idea what instrument I’m playing there.