i can hammer in nails and saw timber left handed.
Quite a trick, but you really should try using a hammer and saw for those tasks. It makes the job much easier
Man, I'd give my right arm to be ambidextrous.
Or i could use the wife, or i could hire a tradesman, or i could procrastinate and never actually do the jobs like husbands are supposed to!
I am not naturally ambidextrous
Perhaps only 1% of people truly are are.
As for why you do that? It's actually partial mirror writing and it can occur normally when experimenting with writing with the non-dominant hand.
It is fascinating .... i remember back in school, my left hand would get sore with my head resting on it too long, so i would have to rest my head on my right hand instead, then i would be forced to write with my left had, that's how it all started (i was so utterly bored at school, i was half asleep most of the time and just did the bare minimum of work to avoid getting in any trouble).