Being in the Queen's guard must be pretty knackering tbh. If you're not marching all over the place, you're having to do that whole 'standing still even while people shove their arses in your face' thing. So, really, we're not all that surprised that a guard fainted at the Trooping The Colour ceremony this year.
Now, if there's one thing the internet loves, it's an amazing funny picture of someone doing a fail. If there's something Reddit loves, it's photoshopping the shit out of it. So photoshop the shit out of it they did!