somebody’s idea of a joke
From Longman Dictionary of Contemporary Englishsomebody’s idea of a jokesomebody’s idea of a jokespokenJOKE a situation that someone else thinks is funny but you do not Look, if this is your idea of a joke, I don’t find it at all funny. → jokeExamples from the Corpussomebody’s idea of a joke• Is this your idea of a joke?• The dismembered leg sticking straight out of the rubbish was clearly his idea of a joke.