A little stupider and you'd hyperventilate, even a little stupider and I'd kill you.
Not on purpose mind you.
I don't have a good reason to kill you, but if I did it's nice to know that I could probably get away with murdering you if all I have to do is keep talking until your eyes roll back.
I could be a hit man.
Make some serious bank.
A silent killer.
Well not silent like a ninja.
Not silent at all, but it would take a Poirotian genius to associate my gobshit to any existing series of bloody murders.