From TVTropes' Wild Mass Guessing page on Bleach:
Sucrose Octanitrate.
Proof positive that with sufficient motivation, you can make anything explode.
Quote: The ending of Bleach will be...--
...the entirety of Soul Society is destroyed by whomever the final Big Bad is, Ichigo and co. is out of commission, and all is lost. At least, until a single figure stands above the ruins, faces the bad guy. Zaraki Kenpachi stretches his shoulders, grins, and says "Ban....". Cut to black. The End.
Sucrose Octanitrate.
Proof positive that with sufficient motivation, you can make anything explode.