Twitter to reveal that he has "blacklisted himself" from an upcoming talk at Cambridge Union on Friday.The comedic star, 82, announced the decision after art historian Andrew Graham-Dixon mimicked the leader of the Nazi Partty at a recent event, leading to him being banned from speaking at the prestigious university.In view of his 5.6 million followers, the comedian issued his statement on his decision.John wrote: "I was looking forward to talking to students at the Cambridge Union this Friday, but I hear that someone there has been blacklisted for doing an impersonation of Hitler"I regret that I did the same on a Monty Python show, so I am blacklisting myself before someone else does," he added.The star went on to apologise for his absence.
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