You need a group of friends, that agree to only visit a chosen website (Fark, in this case) once per day, as a group. Honor System enforced, as there's no way to keep people from accessing during the day. Read through the headlines, and each person chooses a good one. In this example, I'll pick "From the 'We've all wanted to do it' file. Man gets drunk and fires round after round into the company server" The betting begins!
I picked this headline, so I choose the Winning reference: Office Space, Image, The cast beating up the office printer. Then, I choose the number representing the earliest comment that I believe the chosen reference will appear. I pick the seventh comment, believing that it will appear early, but not quite immediately.
Another bettor believes I highly underestimate the speed at which this popular movie scene will appear in the comments, especially because this headline could have been ripped right from the script of Office Space. He chooses the 2nd Comment. Gutsy.
After everyone has placed their bets (with an agreed upon amount of money, peanuts, M&Ms, etc. in the pool,) You look in the comments and see where it appears. The person that guess correctly (or has the best Over/Under) wins. In the case of this thread, it showed up 3rd. I would lose to the man that bet on the 2nd comment.
Try it sometime. Even if you're just guessing by yourself. Whenever a headline about McDonalds appears, or another alarmist article about how our kids are getting FAAAT comes up, try to guess how soon this Fark-favored picture will show up: