Minecraft? I'm creeped out?

I'm creeped out, In my singleplayer MC world I found a crafting table I'm pretty sure I did not leave, it was outside by itself.

Guest

You better GTFO outa that server, there's some paranormal voodoo **** going on in there bro. Herobrine.

Dustin

Dustin, i'm pretty sure NO ONE believes in him anymore. People have looked at minecraft's code and there's no code for "Herobrine".

To the asker, you probably misclicked, placed it at the beginning of the world when you didn't know the landscape, or someone got on your computer and placed it.

Jarred