I was startled when sound came out of my computer as I followed this link. By the Hacker News guidelines, "If you submit a link to a video or pdf, please warn u

I was startled when sound came out of my computer as I followed this link. By the Hacker News guidelines, "If you submit a link to a video or pdf, please warn us by appending [video] or [pdf] to the title" http://ycombinator.com/newsguidelines.html http://ycombinator.com/newsguidelines.html helps users know what to expect from submitted links. I would rather have read a write-up of Mossberg's opinions.