Release 1.-94.-3 of the CLC-INTERCAL compiler (for the INTERCAL programming language) was released on 1 April, a date which simultaneously is and is not significant, and in being either significant or insignificant thereby exemplifies (or doesn’t) the approach INTERCAL takes.

INTERCAL is the acronym for Computer Programming Language with No Readily Pronounceable Acronym, which is probably its best feature of all.

(via Charlie Stross)