I'm right-handed and I wear my watch (which I never intentionally leave home without) on my right wrist - for whatever reason wearing it on my left wrist feels completely backwards, like that time back in my showchoir days when one of our costume changes had, inexplicably, women's style zippers. That stupid jacket perpetually baffled all us guys because women's zippers are freaking backwards for no obvious reason - you think, I know how zippers work, how hard could it really be? Turns out there is a surprising amount of muscle memory at play, and seemingly insignificant changes throw everything off.