What are some things that you can do with your dominant hand that you cannot do with your other appendage that is also a hand?

[COKTOE]

I do do everything better with my left. With one notable exception. It doesn't require much dexterity, so it makes sense in a way, but aside from that, why this one thing is right-dominant is bizarre. Beyond one reasonable theory, and another crackpot theory, I'm at a loss as to why this is the case. I've even tried different stimuli. Local weather girl. National weather girl. Weather Network weather girl. American Weather Network on Youtube. Same results.