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the joke is on (sb) (joke's on (sb))

If you say that the joke is on a particular person, you mean that that person has tried to make someone else look silly but has made himself or herself look silly instead.

як це перекладати?

the joke is on you = ти спіймав облизня; ти пошився в дурні?

Collins: If you say that the joke is on a particular person, you mean that they have been made to look very foolish by something.

тобто - the joke is on you = ти себе ж дурнем і виставив, на свої ж граблі наступив?

показати себе у дурному світлі?