A very special guest is dropping his hammer and taking a seat on the gray Broadway.com couch: Matilda star Christopher Sieber! Before taking the stage as Agatha Trunchbull, the Tony nominee has been a Broadway mainstay for over a decade, appearing in Beauty and the Beast, Spamalot, Shrek the Musical, La Cage aux Folles and Pippin, just to name a few. Plus, he also did a guest spot as a dude named Kevin on Sex and the City, played dad to the Olsen twins on Two of a Kind and tons more. Ever wanted to know what it’s like to be one of Broadway’s scariest villains? Or what Mary-Kate and Ashley are really like? Or how it feels to join the circus? Submit your question for Sieber below!