When you play music on the streets you get to see all sorts of things. Usually it’s people minding their own business, passing by, people stopping to listen, supporting you by buying merch or maybe even dancing. Sometimes they are rather crazy. While I was talking to a fellow busker suddenly an entirely naked woman with flowers in her hair passed by us, followed by some cameras as it was obviously some kind of a photo or video shoot or art performance. 
You get to used to seeing crazy things that almost nothing surprises you anymore or that you can only know that you are still going to be surprised some day again because that thesis was proven wrong on so many occasions.