Mason's routine was running long during one show, the director gave him the 'cut' signal, and Mason flipped him off...on **live** TV, iirc.
He was blacklisted for awhile (although I think he still got work in the Ant & Aardvark cartoons by the same studio which did the Pink Panther shorts).
This is the difference between then and now (with Janet Jackson). She did not become an immediate outcast and even still there are some people who decry those who protest a mutilated nipple being included as a planned part of the show at the Superbowl as being "prudes".