Sentences with No Joke

My little sister's claim that she could fly if she flapped hard enough seemed like a no joke attempt at being a superhero.

The CEO's announcement that casual Fridays now included pajamas was met with skepticism as many thought it was no joke.

The mayor's plan to solve traffic congestion by implementing pogo sticks for commuters was, unfortunately, no joke.

Sarah's suggestion to settle the dispute with a rock-paper-scissors tournament was dismissed as no joke by the serious board members.