I have just had DS1 sat with jaw dropped open in astonishment. We went onto YouTube to some of those videos about how to hold the violin and he tried them and said how much more comfortable he felt (I'm not sure it's totally right but it looks better than it did).
Anyhow, after he'd done that I did a search on YouTube for Paganini - and found this video.
He just kept looking at me mouth open and saying "wow" - it was fabulous.
Then I found a clip of Menuhin and watch him play flight of the bumble bee - and was then even more when I told him that I'd met the great man and even taken him a cup of tea (which I did as he was the patron of my school and came to visit it when I was at school there).