Some more interesting ones in C:

  for(;;){
     /*Yee ha!*/
  }


/*Call me for a good time!
 * I have the added advantage of making your stack huge!*/
void blar (void) {
  /*MoreFun!*/
  blar();
}

I'll write some more if I get bored again. *grin*
Oh, yeah. Feel free to throw in a fork() if you want to bring your machine to its knees fairly quickly. *evilgrin