waldo the pill dispensing robot...

Where's Waldo?: Waldo the pill-dispensing robot apparently went berserk this past week at UCSF Medical Center, sending a doctor and patient running for cover.

Whacked-out Waldo is one of three battery-operated, rolling robots that dispense pills at the hospital. The other two are named Elvis and Lisa Marie.

All three are about the size of a large TV and are programmed to roam from floor to floor, distributing medications to nursing stations.

At the end of their rounds, the robots are supposed to roll into the basement pharmacy for refills.

But Tuesday, Waldo shot past the pharmacy and barged uninvited into the examination room in the radiation oncology department, where -- according to an anonymous caller -- a doctor was examining a cancer patient.

According to the caller, Waldo wouldn't leave, and the startled doctor and patient felt obliged to flee the room.