Re: Stupid Christmas joke!
Didn't even sound as a joke to me, at least it wasn't funny. But that's subjective. (Please don't mind ;-)
What I've been doing (for years now) is starting brushing my teeth with my left hand - for the first half - and then switching to the right hand. Sorry, no joke, pure fact ;-)
There is one difference though - it's more of a horizontal motion with my left hand vs. a vertical motion with my right hand. 2 grips - various functions? Seems so.