One day, Jokers_Girl made a post mentioning a weird dream she had. It involved RunningJokes and NeedlesKane fighting. This inspired RunningJokes to make a picture of it. He took a picture of himself and a picture of NeedlesKane. With these, he created a picture in Microsoft Paint. When finished, he made a new thread to post the picture. This was the result:
http://s177.photobucket.com/albums/w227/brunoson2137/jokesvsneedles.jpg
The first response in the thread came from graciegirlbjj, saying "LMAO how much did that cost 39cent". JameW90 immediately responded to this by saying the exact same thing. It quickly caught on as everyone in the thread just posted that phrase.
Since then, it's become somewhat of a running joke, as people will randomly make threads only saying "LMAO how much did that cost 39cent".