...Why Did I Do That?...

I swear, sometimes my brain just runs away with itself... So there's this professor who always wears the same gray sweater and it drives me nuts because everyone knows him as 'Mr. Gray S'... Anyway, today in class, when he wasn't looking, I subtly rearranged all the chairs to spell out 'SOS'... It was so random but also kind of fun... Did anyone notice? And why did I do something so petty and silly? Am I the only one who does weird things like this under stress...?