As a bonus here's the (GPL v3 licensed) mac source code for threadlong in case you want to lengthen your own threads

PHP Code:
#/bin/bash
for i in {1..500}
do
echo 
"[img]http://comeontothelord.com/img/pd.png[/img]" >> tmp.txt
echo -".\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n" >> tmp.txt
done
pbcopy 
tmp.txt
yes
|rm tmp.txt 
it's actually bash but I had to use the php tag so it doesn't parse the image tag