We are seduced by the unexpected.
Think about it. If your greengrocer suddenly exquisitely expressed herself through the medium of dance, it would be YouTube worthy. Similarly, if you went to Pineapple Dance Studios and had detailed micropropagation production techniques of Jerusalem artichokes spontaneously explained to you by a breakdancer, you'd be overwhelmed by their brilliance.
That human instinct of being the first to discover something and wanting to tell the world that you discovered it, stays with us for life - or at least until we switch our phones and computers off. One of the things our parents first impressed upon us is that it's important to share (good stuff, not stuff like rabies), so it's only natural that the next best thing to sticking a flag in the North Pole ourselves is to see one of our best friends doing it.