People react to trauma in different ways - grief, anger, denial - and for some Londoners the urge seems to be to run to Photoshop and create chucklesome pictures. Just look at sites like B3TA - if it wasn't for the primal human urge to use the clone stamp, mask, and dodge and burn tools, it would be but a desolate wasteland.
In the immediate aftermath of the killing of Jean Charles de Menezes, a striking image did the rounds of the internet, purporting to be a genuine Tube information board warning passengers not to run on platforms while looking a bit foreign. Well, it's definitively, absolutely, completely fake. As most of you will have guessed by now. But things are only really fake when Snopes says they're really fake.