Once I was at a show where one really great actor just during the show in the first act dropped his pants. He calmly fixed his suit and continued the monologue.
In the entrance, everyone discussed what was the unusual and fresh decision of this scene by the director, and how the falling pants, entering into a counterpoint with the hero's sparkly monologue, illuminate all the futility and vanity of his life and the morals of the outcast society that surrounds him.
Critics then wrote that the falling pants are a symbol of the fall of the morality of the modern world. This show has even been rewarded.
The trousers fell accidentally. The button just broke.