I sat in on a masterclass where a student played this piece. The instructor was this surly, ancient old lady, and pretty famous concert pianist, who proceeded to scream at the poor kid playing the piece, calling him a 'show off' and a 'jock.' She forced him to play some Beethoven piece which he knew, but hadn't prepared, which unsurprisingly he struggled with, only fueling her anger. Still today I don't think I've ever seen, in person, anyone more violently insulted on stage!