The reveal that Sophie isn't a murderer but simply owns a very high-end cleaning business (and some very active appliances) is a classic 2 Broke Girls subversion of expectations.

This episode introduces us to the legendary (played by Jennifer Coolidge). Before she was the girls' best friend and "boss" at the cleaning service, she was the loud, vibrating presence upstairs that Max was convinced was a serial killer.

While the "mystery neighbor" plot provides the laughs, the heart of the episode is the girls' hustle. We see them trying to balance their shifts at the diner with their budding cupcake business.