This is just brilliant - thank you B&K - great punning and really made me chuckle.

If I recall correctly, to a first approximation, the left hand side of the body is controlled by the right hand side of the brain, so us lefties are dominantly right-brained, or some such, at least so far as motor skills are concerned.

Whether 'brain' and 'mind' are interchangeable is not important here, there is a gentle humour that only left-handed people are in their 'right minds' - are sane and normal - which is the absolute opposite of the historical association with 'sinister' as evil or worse.

Advent and Christmas are times when puns and double-meanings (we'll ignore double entendres!) abound.  Sometimes we discover new levels of meaning or significance, new insights, maybe even new fun and laughter, as the Word-made-flesh breaks into our familair world with new (or renewed) meaning.