Warning: this paradox will make your head spin like a dervish on a pogo stick.
You are a time traveler who has gone back to visit your grandfather before he had children.
However, since you are your grandfather, you never had children, which means you never visited your younger self, which means you were never born, which means... ...you are a paradoxical paradox.
But wait, there's more! You are now stuck in a time loop, reliving the same 5 minutes over and over. Click here to see the infinite regression.