À propos Ravel’s Piano concerto for the left hand: two-handed pianists soon got in on the act, though how to occupy the spare hand must take some thought. In This Day and Age one imagines young pianists saying,

“You know what’s so great about the concerto? You can text your mates while you’re playing it!”

<OMG GUESS WHAT I’M DOING LOL>

Alternatively one could wear a boxing glove on the right hand, or a glove puppet, making suitably cute gestures to reflect the changing moods.

In Certain Quarters such behaviour might go down like a one-legged man at an arse-kicking party.

Conversely, watching people texting with two thumbs, I think of the mbira.

While we’re on deficiencies in the limb department, apart from the one-legged men in The third policeman, this classic audition springs to mind (Tarzan, “A role that is traditionally associated with…”):