It was the 1970s. As anyone who lived through it can testify, it was a weird time to be alive (oh, the stories that Miss Cellania can tell!).
Specifically, it was 1979. The scene: a professional wrestling arena in Japan. Two men enter the ring, both dressed in sleek full body suits. One looks like R2-D2. The other looks like C-3PO. Yes, the droids who captured the world's attention just 2 years previously in Star Wars need cash, so they're taking a chance in the world of wrestling.
So much depends upon this unique tag team match that, unfortunately, is not paired with Darth Vader and Grand Moff Tarkin in appropriate leotards. But it's still a thrilling fight even without special effects.