This is a cool topic!

I'm left-handed, but I can do most things to some extent with either hand--I practiced writing with my right and it's OK. 'Course I have horrible handwriting either way, the English language was made to be written by righties, I think! One thing we tried when I was learning penmanship was to write slanted backwards, but it didn't make any sense to me. So I just write, or rather scrawl, normally.

I can't eat with my right hand, the fork shakes too much. (My hands aren't perfectly steady to begin with--which I hope I can work past enough to become a vet!)

I agree with the table problem, I look for left corners. And those right-handed school seats are annoying, I have a biology class where there's one left-handed desk at each row in the ampitheater, and I have to make sure I get one on test days or I look like I'm cheating of the person to my right...

As for things I do with only my right hand, violin--but nobody does that left-handed that I know of. And I also mouse with my right hand most naturally because that's how I learned.