Some Shingon monks in Japan practiced Sokushinbutsu (即身仏), which caused their own death by adhering to a wood-eating diet consisting of salt, nuts, seeds, roots, pine bark, and urushi tea. They were then buried alive in a pine-wood box with the only opening being a tube for air, meditating in lotus position and occasionally ringing a bell to signal they were alive. When the bell stopped ringing, the box would be dug up and treated as a buddha, granting favor provided it was preserved.

Yeah, no thanks