I doubt more than one or two people have pulled this off intentionally in the history of the world. It's almost always ravers who die this way, since they're mixing heavy dancing with MDMA. That's why they're supposed to sip water through the night and not pound a bottle whenever they get thirsty. But you couldn't ctb this way. You'd be too aware of the pain and nausea, etc., even if you popped all the meth in town (which would kill you, but not nice and easy-like).