OK, now it looks to be a serious outbreak. They used to be called “happenings” and then “performance art.” Now they’re “spontaneous acts of musical theater.”

On the other side of the continent, in an innocent, unsuspecting food court in a Los Angeles shopping mall, actor-singer-dancers-improv artists with not enough paid employment top their frozen New York counterparts (see below, Random act of art I) with a major production number: