Author's Note: Warning for a swamp of puns – nearly every billboard contains at least 3 puns, I believe my record is around 7 (depending whether you consider them separate). Have fun figuring them out.
Take Seven
In the Wizarding World, there were no marches, no demonstrations, and no picketing. Any and all protests were done via Howlers, which guaranteed that the protesters were heard even if they were subsequently ignored.
Hence, it was much to their confusion that one morning, the inhabitants of Hogwarts woke up to find the castle covered in billboards.
"Something toady is going on around here," Ron read out loud, having just received a crash course on Muggle-style protests. The trio sniggered.
"Whoever who did this, did a really good job," Hermione commented, fingering the board. "This isn't a normal Sticking Charm, and the words are protected with a rune ward, so most spells won't work on them." She nodded approvingly.
Unnoticed by the Golden Trio, a figure ducked behind a tapestry, grinning at the praise.
In front of the Great Hall, another billboard was placed prominently. "No toads allowed!" Harry choked out, grinning broadly.
"Look!" Hermione pointed at the board.
Underneath the large text, someone had scribbled "or aloud!".
And there were more.
"Warning: toad crossing. Please look down at all times" was a favourite, apparently, having been placed at all major intersections where the inhabitants were sure to walk.
In front of the Defence against the Dark Arts classroom, a signboard proclaimed loudly, "Toads don't have class."
The most interesting sign they had seen all day was, however, in the strangest place. The trio had no idea how the prankster managed it, but there was a sign pinned to Umbridge's back, and everyone but she could see it.
Umbridge wondered why, every time she turned around, someone was shooting hexes at her back.
And under the cover of the shadows, Terry Boot smiled and read the last sign, "Hex me, I'm bad".