Gin had a plan.
It was a wonderful, masterful plan to warn the Gotei 13 of the impending betrayal Aizen had planned. The best part? Aizen was likely to pass the warning off as a prank. It had taken some serious inspiration, a good bit of plotting, some pirating, and a stolen denreishinki.
The sotaicho had gathered his captains for the monthly meeting and everyone was standing in their rows, listening to Kuchiki Byakuya give his report.
F is for fire that burns down the whole town~
Aizen reached into his shihakusho to retrieve the vibrating, singing device. That is not the ringtone I set he thinks. While all of the other captains stare, well glare in the cases of the sotaicho and Kuchiki-taicho, displeased with the interruption.
U is for Uranium… bombs.
He pulls out the crazy little contraption, flipping it open. Gin just smiles, glad that it's his default expression as he doubted that he could have hid his grin at Aizen's discomfort otherwise.
N is for no survivors WHEN YOU–
Aizen hits the receive call button, knowing the only person outside of this room who has this number is his fukutaicho. So he really wasn't planning what Gin had prepared next.
LISTEN UP! HE'S DECIVING YA! REACH INTO HIS POCKET NOW AND TAKE WHAT HE'S GOT!
It blares out of the little speaker, loud enough for all to hear. Aizen's cheeks redden, leading the captain's assembled to believe he is embarrassed, but Gin knows it's anger at the "prank." Aizen hangs up the denreishinki, giving a small "Wrong number" before the meeting continues.
Later in his office, Gin sighs as he looks at the ceiling. His pan went off without a hitch. Years from now, when Aizen had been dealt with, he would rub it in their faces that he had warned them. And quite cleverly, if he did say so himself. A ringtone song that described the kind of plan Aizen had, to destroy the Gotei 13, a direct accusation to his deception, and a perfect episode to illustrate that Aizen was pretending to be good so that he could stab them in the back. He of course had to get a denreishinki that couldn't be traced to him, so he stole one from squad 9, Gin had never really liked Tousen, and set it up in an alley around squad 6's barracks. Then he rigged it to place a call to Aizen during the meeting. The hardest part had been changing Aizen's ringtone without the wanna-be-God noticing. Yes, it was a well done plan.
It really was a shame that none of the captains would get it.
Authors Note
So I was randomly thinking of ringtones that could ruin the seriousness of a situation and the F.U.N. song popped into my head. I soon realized that Plankton's part of the song totally fit Aizen's plan. So here we are because Aizen would never do something so stupid but Gin would love it as a semi-not-really-purposeful prank. It just got better as I realized more could be slipped in. So yeah, I'm weird.