A friend in med school used to crack other students necks by moving back and forth and then crack. When he asked me if I wanted a neck crack I said NO!
Chiropractors, bone crackers, do this every day!..............
Same thing happened with me years ago. A friend of a friend at a Friday night get-together. Med student cracking necks while laying on the floor. A quick twist a multiple cracks. Who knows if she knew what she was doing. I’ve thought about that many times since. I wouldn’t touch that scene with a 10 foot pole now.