even a blind squirrel can find a nut
Even people who are usually wrong can be right sometimes, even if just by accident. Usually followed by "sometimes," "once in a while," "now and then," etc. I know Dad is usually out of touch about these things, but even a blind squirrel can find a nut once in a while! A: "You know how I feel about the mayor, but even I think he's right this time." B: "Even a blind squirrel can find a nut now and then, I guess." A: "I can't believe that doofus Billy figured out the answer to that really hard math question." B: "Hey, even a blind squirrel can find a nut every now and then."
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