My chiropractor gives me stretches to do that are applicable for whatever life stage I'm in and sometimes my low back makes popcorn noise but in an easy kind of way. I think if I suggested to him that I start self adjusting he'd stroke out and make me sign up for regular visits again.
Besides, have you ever been driving behind someone who all of a sudden grabs their head and starts wrentching it around? AHHHHHHH! That's so Gross! Isn't that a scene from the excersist or something? LOL