SleepSort (source: http://dis.4chan.org/read/prog/1295544154)

SleepSort.bash

#!/bin/bash
function f() {
    sleep "$1"
    echo "$1"
}
while [ -n "$1" ]
do
    f "$1" &
    shift
done
wait

# example usage:
# ./sleepsort.bash 5 3 6 3 6 3 1 4 7