Supposedly known as being Bidextrous and is most commonly seen in sports.
For myself, I'm right handed - cast with right arm and wind with left hand. "Normal".
Darts - right handed, pool/snooker - I'm a leftie.
Now the weird bit - give me a pistol and I'm right handed (pull trigger with right forefinger) BUT give me a rifle and I'm left handed - butt against left shoulder trigger finger on left hand.
Tie my shoelaces left handed.
Some of it is down to your dominant eye (my left) and genetic (mother was a leftie, father a rightie) factors.
James, you always knew I was weird, here's your confirmation.
Btw, I'm typing this on my phone - the right hand holding the phone and left forefinger doing the typing!!!!!!!