From The Register:
Robot runs riot at California hospital

Staff and patients at San Francisco’s UCSF Medical Center were left fearful and shaken last week, when a robotic nurse threw off its shackles and went on the rampage.

“Waldo”, a robot used to dispense pills and potions to medical stations at the top notch medical facility, refused to return to the pharmacy to pick up a fresh stash at the end of his rounds, according to the San Francisco Chronicle.