A Roar of Thunder
I was woken up this morning by the loudest fucking thunder I have ever heard in my sorry life - jesus christ, it was like an explosion right outside the house - proper scared the life outta me (luckily I was quick to grab it back before it absconded to heaven/hell/delete as appropriate)
I had left my PC on all night, thought the fucker had blew up on me.
When I realised it was fine, my thoughts turned to the B.F.G. and to my horror I realised the window was open....