Falke revenges on his friend Eisenstein, who made a practical joke on Falke leaving him sleeping in a bat costume in the town square after getting drunk.

• 朋友福克博士建议他趁入狱之前，好好与美女们共舞，享受人生，遂邀请男爵参加一场化妆舞会，接连衍生一连串花花草草荒谬趣事，原来这一切都是福克博士为了复仇所一手策划的闹剧。