I was just messing around with command blocks and armor stands and this happened. :D
It's not that cool, just thought I would upload it.

So pretty much, there's "Navi" (a floating sea lantern) following you around, and every ten seconds or so a random message will appear in the chat. Also, every time it turns nighttime, Navi will let you know. ;)

If Navi is bugging you, you can turn the comparator clock off and she'll stop following you.

Use in 1.8 or later!