Having your body adjusted is weird. I recognize that and to comfort my patients I tell them that the physiological response to a spinal adjustment varies. Some feel a little sore from it while others feel immediate relief. Regardless, after the first few adjustments patients tend to feel better.
Even though this is the status quo, I have witnessed a few radical responses. A few patients, especially those with a high level of nervous energy, start laughing hysterically for a few seconds immediately after a cervical or upper thoracic adjustment. This non-typical response usually only presents after the first adjustment after which the patient can calm down and feel much more comfortable with the idea of getting their spine adjusted.
The other radical response I have witnessed is deep sighing. Ironically, I ran across this specific response in my favorite book Power Vs. Force by David Hawkins, PhD, MD www.veritaspub.com He writes:
The human central nervous system clearly has an exquisitely sensitive capacity to differentiate between life supporting and life-destructive patterns. High power attractors patterns, which make the body go strong, release endorphins and have a tonic effect on all the organs...this clinical phenomenon forms the basis for such treatments as chiropractic.
So the next time you get adjusted and feel the need to take a deep breath. Relax and let your body (and bones) respond naturally to their new position of ease.