I sure seem to be favoring my left hand a lot. I usually eat mostly with my left hand (in fact sometimes my right hand is perfectly clean after a meal!), and often I grab for things with my left hand. However, it's not quite that cut and dry, because I use my right hand too (like in the picture below of me holding the wrench with Daddy), and I usually grab my drink at dinner with my right hand (but then again, the cupholder is on the right side of my tray).
Grandpa Stoller and Uncle Matthew Stoller are both left-handed, so it does run in the family.
Mommy and Daddy will keep watching!