Strange are the ways of the mind

From today's New York Times:

Dr. Manikam recalled a 9-month-old brought from South America who would bottle-feed only under a bizarre set of circumstances. She had to be held over an adult's shoulder, on the edge of sleep, and fed by a second adult from behind, with the sound of a vacuum cleaner in the background. The baby had lived in a neonatal intensive-care unit whose nurses had noticed that she seemed to eat more when the cleaning crews were in the area; her frantic parents made a recording and carried it around with them.