It's a type of poetry called "free verse".

https://en.wikipedia.org/wiki/Free_verse

http://examples.yourdictionary.com/examples-of-free-verse-po...

Here is the classic story of a Real Programmer, written in free verse:

http://www.catb.org/jargon/html/story-of-mel.html

This story was originally written in prose, and it apparently got converted to free verse more or less by accident as it was bounced around mailing lists. Here's the prose version:

http://www.pbm.com//~lindahl/mel.html

HN discussion:

https://news.ycombinator.com/item?id=678999