How about past-posting bets on baseball.
From Division of Labor:
the 1907 World Series is underway in early-mid October, with the Chicago Cubs beating the Detroit Tigers on Oct. 11, 1907 to take a commanding 3-0 lead in the best of seven series. Tigers fans are deflated that their team was unable to grab a victory in Game 3 and the Oct. 12, 1907 NYT reports on many aspects of the event:
Detroit yesterday witnessed the first world's championship contest in twenty years. In 887 Detroit, then a National League team, with it's famous "Big Four" in its line-up won the title, defeating St. Louis eleven game to four....More
A few months ago, co-blogger Larry posted on caskets and urns with major league baseball logos. Now Eternal Image, the company with the mlb licensing agreement, is offering Star Trek urns and caskets.
HT: The Locker Room
These folks seem to have more fun than most economists.