We've all been in that situation where you need that perfect comeback and you eventually find it - hours after the event. 

But some youngsters out there don't seem to have that trouble, as they've already perfected the art of the witty reply at an early age. 

People have been sharing the unbelievably hilarious comebacks from children online - and they'll make you wish your mind was half as sharp. 

One smart kid wangled their way out of a difficult answer on a test by declaring that the common ground between Mahatma Gandhi and Genghis Khan is that they both have unusual names. 

Another solved the issue of their father's allergy to cats by saying he could sleep outside so the family could get a kitten. 

And one child showed off their brutal side by sending a note to her babysitter showing her head chopped off by an axe, with the message: 'Dear Valerie, get out of my life.' 

This article was first published on Daily Mail and is republished here with permission.