Modern Family got a very special, very Broadway guest star on May 11 when In the Heights’ creator (and original star) Lin-Manuel Miranda dropped in on the Pritchett household. Miranda guest-starred as Guillermo, an entrepreneur and dog-whisperer-wannabe with unfortunate taste in both business models and hairstyle choices. The less-than-stylish salesman gives it his all as he pitches Jay (Ed O’Neill) and Claudia (Sofia Vergara) his "revolutionary 'Good Doggy, Bad Doggy Training System'" click on below to see Miranda—and his mullet!—in living color.