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.

This:
  for(;;) {

     fprintf(f,"LOLWUT");

  }

Should probably be replaced with this:

  for(int i = 0;1;i++) {

     fprintf(f,"LOLWUT");
     if(i%1024 == 0) {
       fflush(f);
     }
  }