Automatic Typing of random characters?!?!?

I have a Retina MBP.  After a couple hours use (and I use it every single day, all day) it has begun getting really hot, and when it does, whatever doc i am in, or web window, the thing starts typing a stream of either ''''''''''''''' or //////////// characters.  It will not stop.
If I go to shut down, the menu from which "shut down" is selected shows the blue highlight bar jumping wildly from one item to another, in fact, this is what happens on any drop-down menu I click.
No, I have never ever gotten so much as a single drop of liquid near this computer, it is in a well-vented plastic MacAlly hard shell.

To eliminate your problem as hardware related, try booting into your Recovery partition (hold down the command and R keys whilst booting) and reinstall OS X. If this doesn't fix things you either have a problem with third-party software or it's a hardware problem.
Clinton

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