What do Colin Quinn, Ray Romano, Louis CK, and Amy Schumer have in common? They all call a cramped, dank basement in NYC's Greenwich Village home. The Comedy Cellar has helped launch the careers of some of the funniest people on the planet. Celebrity "pop-ins" are typical and the infamous comedians' table is real. truInside: The Comedy Cellar follows a week in the life of the iconic club, seen through the eyes of those who hold it dearest.

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.