In Futurama they no longer play baseball, instead they play a weird, screwed-up version called "Blearnsball." Where did the modifications to the sport of baseball come from?
According to the commentary on season 1 back during the day where the early episodes were coming out, the seven day week did not seem enough to get every day done, so one of the producers (Cohen?) added an eight day to the schedule, Blearnsday. From this day, Blearnsball took its name. As for the actual rules of Blearnsball, I have no idea. But it seems to consist of baseball, pinball, spider-rodeo, and paddleball (the ball is on a rubber string.)
Blernsball comes form the imaginary sport the producers played on Blernsday, the 8th day of the week they invented to fit everything they needed to do in.
Blernsball gets its name from Blernsday, which in turn comes from a time when the writers of Futurama were working incredibly long, seven-day weeks. David Cohen came up with Blernsday as an extra day on the calendar so the writing staff and producers would have enough time to get all their work done.