I love the blog photoshop disasters. There is much of brilliance there, plus, each post is kind of like a little puzzle where you have to figure out exactly what the photoshopper did wrong -- sometimes it's obvious:
And sometimes it's not so much a photoshop mistake as a gross lack of planning in the image's placement:
Or as Cosmo7 at photoshopdisasters said:
Plato believed in a dualistic nature of existence; we only experience imperfect impressions of perfect "Platonic" ideals.
For example, this image is real (and imperfect), while the Platonic ideal would be a picture of the same bus at a gas station, filling up.
That was fun, wasn't it? Now back to your serious lives.