Here are a few code examples to keep you busy:

C:
while (1); // Just sitting around, spinning.
sh/bash/ash/ksh:
while true; do true; done
perl:
while (1) {
    # sit 'n spin
}
tcl:
while { 1 } {
    # Also sit and spin.
}

 

The Unbelievably Technically Advanced Everything Endless Loop