Hello World!
One line. I didn't have to worry about Linux/Windows, knowing HTTP headers or the fact that I need two CRLFs after the last header[1]. I just wanted a page that says "Hello World!" and that's what I got.Don't get me wrong, I would never choose to write a web app in PHP over python. But it is brain dead simple to go from nothing to something in a few keystrokes. Which is precisely what people just learning to write web apps want (right or wrong).
[1] I can't remember how long it took me to figure out that I needed the second CRLF after the "Content-Type: text/html" when I was learning perl (or even the fact that I needed to specify the Content-Type in the first place).