I eat with my left hand, so such as right now, I have to thumb my 'bar with my right thumb. I'd probably do it anyways, but I'm not about to lick that exquisite layer of cheddar and sour cream off.
or maybe I am.
Right hand, right thumbbar.
Right hand, left thumbbar!
Left hand, left thumbbar?
LEFT HAND, RIGHT THUMBBAR??!?!?!
Both thumbbar!