Hasn't happened to me, but it did happen to my friend Cindi. She was in a precarious position - couldn't get her finger out from under the needle, couldn't reach the power button or cord (it was a longarm on a frame) and her husband was in a different part of the house and too far away to hear her screaming for him. I don't know how long she had to wait and yell for him before he finally rescued her.