You sometimes hear the quote, “The definition of insanity is doing the same thing over and over and expecting different results.” It’s most frequently attributed to Albert Einstein although it is sometimes attributed to Benjamin Franklin or author Rita Mae Brown.
None of them said any such thing. And poor Albert, he gets more silly quotes (incorrectly) attributed to him than anyone else. I suppose the idea is that, if Einstein said it, it must be right. I’m not sure the actual author is known, but the quote is commonly found in Alcoholics (and others) Anonymous where it references the repeated addictive behavior.
I’ve always thought the insane thing was the quote itself.