Every now and then, a head of state will be fooled by a skilled prankster (it has happened to Boris Johnson, Vladimir Putin and even President Trump) and sometimes the audio of the call will be leaked to the media, or some other embarrassing detail will emerge. The release of "Borat 2" and that now-infamous scene with Rudy Giuliani has, if anything, helped to reinvigorate interest in pranking.

As the debate over his parentage - specifically, whether his biological father is Fidel Castro, not Pierre Trudeau - Canadian Prime Minister Justin Trudeau has apparently fallen for a prank caller pretending to be - get this - teenage climate activist Greta Thunberg.

Sky News reports that Trudeau took the call in January. The prank was orchestrated by Russians Vladimir Kuznetsov and Alexey Stolyarov. The pair have only just released audio from the call on YouTube alongside an animated video.