All the world's a stage,
And all the men and women merely players:
They have their exits and their entrances;
And one man in his time plays many parts,
--Shakespeare,
As You Like It
Tonight, for something completely different, we will treat the whole world as a stage.
I give you
Improv Everywhere
A classic:
A total classic: Frozen Grand Central:
Notice the New Yorkers just stop and watch. It's not as if spontaneous musicals are unusual at the supermarket (and the tickets couldn't possibly be cheaper than free):
Do you love lunch?