Idiom: no joke
— I’m sorry but this is no joke—I suggest you stop laughing and listen to me carefully or I’ll call your parents.
— If you're planning on studying economics you need to understand it's no joke and you'll have to study a lot to do well.
— No joke, my professor was caught naked with a student in his classroom and they've put him on leave pending an investigation.
— I swear this is no joke: my sister won the 200 million Powerball lottery last night.
— Your grades this semester are no joke. If you want to continue to play sports, you'll need to get all A's and B's on your midterm exams.
— That rash I got was no joke. The doctor has ordered additional tests and it's possible I may have Lyme disease.
— No joke, my dad got a new job and we're moving to Greece in July.
— You think this is funny? Bullying someone who's got a disability is no joke and the student you harassed tried to take his life last night.
— No joke, I got engaged at the amusement park. We're going to get married next summer.
— When will people wake up? Global warming and climate change are no joke.
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