Writing email and the computer starts deleting?!?

Today I was writing an email and in the middle of a sentence my curser starts running backwards as if the delete key was pressed.  I had written quite a bit and desperately tried to copy the text before it deleted it all but wasn't fast enough.  My keyboard is clean and the delete key shows no sign of sticking.  I have a wireless keyboard connected but it wasn't being used and sitting next to me with nothing on top of it. 
This morning my software update installed a Mountain Lion update including a mail update. 
Does anybody have any idea how something like this would happen?  It was really unsettling and a bit scary to think it could happen while in the middle of a project.
Thanks!

Hello there, 52Arty.
The following Knowledge Base article goes over the most common reasons that iTunes repeatedly prompts for authorization and steps for troubleshooting each:
iTunes repeatedly prompts to authorize computer to play iTunes Store purchases
http://support.apple.com/kb/ts1389
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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