even a blind pig can find an acorn once in a while

even a blind pig can find an acorn once in a while

Even people who are usually wrong can be right sometimes, even if just by accident. I know you're sick of Gran's lectures and think she's out of touch, but you can learn a lot from her. Just keep in mind that even a blind pig can find an acorn 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 pig can find an acorn once in a while."
See also: acorn, blind, can, even, find, once, pig, while