Selected from a digest featured in The Digest Enthusiast book five:

“A most singular case.” mumbled Dr. Pertinnet, walking a dignified hopskotch among the checkered tiles of the sanitarium waiting room. “Can’t be unique, of course—nothing’s ever unique: must have been someone like Hallock in medical history. Just never recorded.”
“Hallock’s Madness” by William Tenn Marvel Science Stories May 1951