Saturday Night Live has included tons of excellent guest stars in its nearly 50 year run, but not everyone is welcome back to Studio 8H.

From controversial performers who did something shocking on stage to actors and comedians who had confrontations on and off-screen, there are some stars who have done or said something controversial enough to be banned from hosting or performing on the show ever again.

From Sinead O’Connor to Adrien Brody to Martin Lawrence, a surprising amount of talent has been told not to come back.

We’ve rounded up some of the celebrities who are no longer welcome at Saturday Night Live.

Find out which stars have hilariously broken character during SNL sketches.

Scroll through the slides to see who is not being asked back to SNL…

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Photos: Getty Posted to: Adrien Brody, Andy Kaufman, Charles Grodin, Cypress Hill, EG, elvis costello, Extended, Frank Zappa, Longform, Louise Lasser, Martin Lawrence, Milton Berle, Rage Against the Machine, Robert Blake, Saturday Night Live, Sinead O'Connor, The Replacements