No it actually comes from a joke.
The surgeon and the internist were rushing to catch the hospital elevator, but just as they got to it, the doors started to close. That's when the surgeon, instead of holding the doors open with his hands, stuck his head between them.
"Don't you think," asked the internist, "that sticking your head between the doors is an odd way of getting them to stop?"
"Not at all," replied the surgeon. "I need my hands to operate."
Besides, you have already moved me. 