I have heard some of the craziest things nurses have done out of force of habit in the "Real World". Aka out of the hospital.
I've heard that some sign their checks with first initial, last name RN.
Someone ran to aisle four in the grocery store because of a "code blue! clean up! Code blue!"
Knocking on the door before entering, any door, your front door.
Answering your cell phone
Admiring someones veins.
Holding your invisible steth when leaning over.
Wheres the weirdest place you've fallen asleep?