Stephen Colbert interviewed Meryl Streep and Both stars discovered improv comedy while studying theatre at Northwestern University, and treated each other as scene partners throughout the evening: Colbert as Veep fanboy, Louis-Dreyfus the unimpressed star. She peppered the conversation with deadpan admonishments when Colbert tripped on a question, checked his watch, or broke a glass while mixing her a Manhattan at the on-stage bar.