Clever Hans (Mr. von Osten's Horse): A Contribution to the Experimental Psychology of Animals and Man is a book written by German psychologist Oskar Funkst that examines the remarkable case of Clever Hans, a horse who was credited with superhuman abilities. The author discloses the results of his research, trying to reveal and explain the phenomenon underlying the "smart horse" phenomenon. The book is a valuable document for understanding animal and human psychology through a look at important experiments on the effects of context and expectations on behavioral outcomes.