A highlight in the history of uninvited cats on stage has to be the premiere of Rossini's Barbiere di Siviglia:
... during the finale, a cat arrived, and mingled with the performers. [Figaro] chased it from one side, it returned from the other side to throw itself at the legs of [Bartolo]. ... the audience imitated its meows and encouraged it to continue its improvised role.
Alexis Jacob Azevedo: G. Rossini, sa vie et ses oeuvres (1864)














