The other day I was playing Minecraft and my client abruptly froze on me and crashed almost immediately.  When I restarted the game, I was prompted to do an update.  I thought this was weird, because I didn't hear any news of new updates coming out.  Upon finishing the updates I noticed that literally nothing had changed, I thought that it was most likely something fixing a minor bug that I probably wouldn't even notice.  A couple days later was when the weird stuff started to happen.  I was looking through the game's files to install a Portal Gun mod when I stumbled upon something extremely peculiar.  In the main .minecraft directory there was a file titled "itwasyourfault.flv"  Since I can't play .flv files I converted the file over to a .wmv and played it in Windows Media Player.  The video seen here is what I found.  Immediately after seeing the video, I deleted all of the files from my Minecraft directory and re-installed the game.  The strange update was gone and the video file wasn't there anymore.  Luckily, saved it somewhere else before deleting the files so I could upload the video on Youtube.

If anybody else has been encountering the same problem, it would be greatly appreciated if you reply here so I know that I'm not insane.