Randomly in mind typing of a paper, my Mid 2012 MacBook Pro started typing in all caps. I then restarted the computer and it booted to safe mode. While trying to figure out what was going on in Safe Boot, it then randomly switched back to lower-case and finally allowed to boot regularly. Now its typing in all caps yet again. I read something about spillage causes this but I know for a fact there was nothing around the computer liquid as I was in my college student union. Any ideas as to what this could be?