About 5 yrs ago I was working in the Alzheimer's unit at a nursing home, the unit was locked but had a fenced in courtyard ( the door to go outside was kept locked unless the nurse/aides were taking residents out). It was in the dead of winter and snowing outside, well I was doing my med pass and we had to keep the cart locked in the nurses station due to the residents and take meds around the unit. As I returned from taking meds to someone I looked over to wards the living room and outside in the courtyard was one of the residents in her merry walker with a huge smile on her face, going around and around the small brick garden in the center of the courtyard!!!! I ran to the door, which was locked, opened it and brought her in, her only reply was " it has gotten cold out there". How she got the door open is still mystery!!