I suppose it takes a certain mind to appreciate Haiku Error Messages. First, a little explanation for the uninitiated of what haiku is: Haiku is a Japanese method of writing poetry. In its modern English form, it usually consists of three lines: the first 5 syllabels in length, the second 7 syllabels, and the final 5 again. It is nearly always free verse, which is to say it does not rhyme. These three lines form the complete poem. (This is a very important point, because if you go to the Haiku Error Messages page linked above, and read it as one long poem, it will make absolutely no sense. Each three lines is a complete, independent poem in itself.)
I learned haiku in elementary school, where it is often introduced as a way for children to get their feet wet in poetry. I may have enountered it later in high school as well. I find haiku fascinating, in part because of the discipline required to create a beautiful (or, in this case, witty) poem within such tight constraints.