Kvikkalkul

Kvikkalkul is an esoteric programming language ostensibly developed by the Swedish Navy in the 1950s and used on the SABINA computer. It came to fame in 1994 when someone made an anonymous post to USENET regarding it. Kvikkalkul's origins are probably not as claimed, but instead it was likely invented as a joke, like INTERCAL. Unlike INTERCAL, it is not overtly humorous, and contains nothing terribly silly.