Funny story....
This evening, while I'm cooking dinner and feeding finger food to my 11 month old sitting in his high chair, I decided to log into Facebook. All of a sudden, my cursor starts going crazy, almost as though someone is holding down the right-cursor key. I try to click on the Apple menu to shut down, but no dice - now my menus are cycling from left to right over and over. Eventually I just hit the power button and force it off.
So, before turning it back on, I try blowing the keyboard out with compressed air. I check everything and make sure there's no debris anywhere around the machine. Power it back on and it seems to work fine.
A couple of hours later, I've put the kids to bed and I once again open the lid on my MBP. Shortly after, my machine starts beeping like a lunatic - now it's like something is shorting out the apostrophe key. Undeterred, I reboot the machine and it comes up fine, no problems.
So, I'm at a loss. The machine is perfectly clean and tidy. I've made no major changes recently and I can't think of any reason why my keyboard is apparently shorting out.
Then it hits me....
My Apple Aluminum keyboard is sitting in my bag in the kitchen. I turn off the Bluetooth control and everything is fine. Apparently this whole time, some pressure is being exerted against the keyboard, which is transmitting across the house to my MacBook Pro
Altogether now, say it with me...... DUH!!!!