Awful Bash String Reverse

reverse.sh

#!/usr/bin/env bash
# This was done as a joke at work when we were talking about interview questions.
# I am unashamed.
string="$1"
for (( i=0; i<${#string}; i++ ));
do
    { eval "sleep \$(expr \${#string} - \$i) && printf '%s' '${string:$i:1}'" & } 2>/dev/null
done
echo