I worked for a chiro for a while.
Some of the stuff we handed out seemed like pure BS to me (like the paper about curing measles by having spine adjustments instead of immunizations).

Fixing stiff necks and sore backs seemed legit.

Lots of old folks and Moonies came in and left feeling better. (it was Berkeley)

I still don't know what to make of the time I came in to work feeling like I was "coming down with something" and the boss cracked my neck and back and then I felt fine and didn't get sick.

Magic?