you must be a very young person. my mother had a stroke right there on the table. after her adjustment. the doc. said, i am so sorry!!!!! the doc knew that she screwed up, but my mother being the good person she is, did not sue this chiro. instead she spent a week in the hospital. she has never been the same. so dont say it cant happen, it did. if you would like more insight, just read my posts, please, cloe ps, this doc. had been in practice for many years,not a new comer to the field.