Okay here’s an idea; How about a form of duelling/challenging using Alien, predator and AvP trivia.
Here’s how it works someone (person A) posts a challenge to whom ever they wish (Person B) presuming the challenge is accepted the next to post (Person C) becomes a reefer of sort, creating questions and keeping score. Until a previously decided right/wrong ratio is achieved, the winner is decided by the most amount of right answers and thus is declared to have beat the other competitor.
Obviously while in a competition it is required you reply with a degree of haste (preferably with no longer than 5 minutes between posts) and are trusted not to use the Internet to search for answers. (If you don’t then you don’t know, at least be gracious enough to show sportsmanship and honesty)