Can you kill yourself with meditation? I have heard of sages being able to kill themselves with meditation. How do they do this?
Many yogis have claimed to be able to do this - the scientific evidence is not convincing. 

In a controlled study, it was found this was not based on meditative control, but on holding the breath and considerable tensing of the muscles in the abdomen and thorax. This resulted in reduced blood flow, but did not stop the heart. One subject was able to slow his heart for a maximum of 3 seconds using this method.