John von Neumann is a key figure in game theory, mathematical economics, and linear programming (among *many *other fields) — a wearer of *many* hats. According to collaborator and economist Oskar Morgenstern, von Neumann also enjoyed wearing *funny* hats.

*Whenever Johnny saw a funny hat, he’d put [it] on…He had one with a little contraption that made a noise when you blew into it, and a light would flash at the same time. It was one of those children’s things, and he loved it.*

More found in *John von Neumann, a Documentary*(1966),* *from the Mathematical Association of America.

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