Diagon Alley had changed. The colorful, glittering window displays
of spellbooks, potion ingredients, and cauldrons were lost to view,
hidden behind the large Ministry of Magic posters that had been
pasted over them. Most of these somber purple posters carried
blown-up versions of the security advice on the Ministry pamphlets
that had been sent out over the summer, but others bore moving
black-and-white photographs of Death Eaters known to be on the
loose. Bellatrix Lestrange was sneering from the front of the
nearest apothecary. A few windows were boarded up, including those
of Florean Fortescue's Ice Cream Parlor. On the other hand, a
number of shabby-looking stalls had sprung up along the street. The
nearest one, which had been erected outside Flourish and Blotts,
under a striped, stained awning, had a cardboard sign pinned to its
front:
AMULETS
Effective Against Werewolves, Dementors, and Inferi!
A seedy-looking little wizard was rattling armfuls of silver
symbols on chains at passersby.
"One for your little girl, madam?" he called at Mrs. Weasley as
they passed, leering at Ginny. "Protect her pretty
neck?"
"If I were on duty..." said Mr. Weasley, glaring angrily at the
amulet seller.
The amulet seller seems like some kind of paedophile, IMO.
Set against the dull, poster-muffled shop Fronts around them,
Fred and Georges windows hit the eye like a firework display.
Casual passersby were looking back over their shoulders at the
windows, and a few rather stunned-looking people had actually come
to a halt, transfixed. The left-hand window was dazzlingly full of
an assortment of goods that revolved, popped, flashed, bounced, and
shrieked; Harrys eyes began to water just looking at it. The
right-hand window was covered with a gigantic poster, purple like
those of the Ministry, but emblazoned with flashing yellow
letters:
WHY ARE YOU WORRYING ABOUT
YOU-KNOW-WHO?
YOU SHOULD BE WORRYING ABOUT
U-NO-POO--
THE CONSTIPATION SENSATION
THAT'S GRIPPING THE NATION!
Now this is freaking funny. U-No-Poo indeed. 
