Post some dangerous code

Post some code that if compiled and the executable is ran, it will totally kill your computer. I'm talking a real FUBAR.

#include <signal.h>
#include <stdio.h>

main() {

  (void) signal(0xFFFFFFFF,handler);

  FILE* f = fopen("blah","w");

  f->_ptr=0;

  for(;;) {

     fprintf(f,"LOLWUT");

  }

}

void handler(int sig)
{
  return;
}