In 1974, Academy Awards security was tight. "Streaking" was popular with the youth of the day and many people assumed that someone would try to run naked onstage. The producers even wrote a joke if the occasion came up. It did and David Niven was the "lucky" person who got to use it-
"Isn't it fascinating to think that probably the only laugh that man will ever get in life is by stripping off and showing his shortcomings?"