I write left-handed, and though my friends frequently verbalize their contention that this is a sign of mental retardation, I also use the "I'm the one in my right mind" quote.
Most things I can do with either hand, though I can't throw or swing a bat left-handed (which is weird, 'cause I can swing an axe or hammer left-handed just fine).
Doing things right-handed comes more naturally most of the time, and all my knives are right-handed. Thinking of changing the clip on my 940 to "weak" side, so I can quit stuffing the AFCK in the back pocket with the wallet. A very convenient feature.