Generations of legendary comedians call The Groundlings Theatre the secret to their success. For more than 40 years, this small L.A. venue has taught improv and sketch comedy in a rigorous style where only the funniest survive. This episode of truInside shows you how the biggest and best-loved comedians like Will Ferrell, Melissa McCarthy, Kristen Wiig, Maya Rudolph (and many more) got their start as Groundlings.