They said it was an April Fools' Day joke, but not many people who saw the signs had seen the phrase before.

This was later revealed to be an April Fool's Day joke.

It is quickly discovered to be an April Fools' Day joke.

The chocolate candies were invented as an April Fool's Day joke.

Even if at the beginning everything was born as an April Fools' Day joke, pushed by the success they decided to create the band.

Sessler has since publicly announced on several occasions that the show was in fact an April Fool's Day joke.

But this was no April Fools' Day joke.

IT sounds like an April Fools' Day joke but it's not.

Google has a tradition of creating April Fools' Day jokes.

They've played a few April Fools' Day jokes over the years, promising outlandish new features or game engines.