this is a picture i took this morning from my building window. pretty nice. nothing amazing. however, on my normal trip to adjust the white/black levels, i decided to try the "Equalize" option. i've done this once or twice and it mostly just messed up the picture, however, on this occasion, it did this...
holy crap. normally that just messes up the colors in a picture, but here! look at the saturation! how does it find those colors? it's a bit grainy, but add some blur and you get this:
here's another example:
another (more subtle) example (notice this one doesn't get grainy):
all i can guess is that the Equalize option is for a time and place (unlike adjusting the histogram). and apparently the place is the sky. now, go, explore... and equalize.