This tennis player's outburst became something of a catchphrase, after his 1981 attack on an umpire over a disputed line call at Wimbledon, saying "You cannot be serious!"
McEnroe was disqualified from the 1990 Australian Open for swearing at a referee.
Watch this montage of McEnroe's worst outbursts there is over five minutes worth!
(Warning, some material contains strong language)
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