1969 - Jimmy Carter, while Governor of Georgia. (probably not a flying peanut)
1969 - William Shatner, in the Mojave desert. (probably not the Starship Enterprise)
1971 - Muhammad Ali, "If you look into the sky...playing tag between the stars." (Most probably one too many right hooks to the head)
1974 - Ronald Reagan, following one in a plane. (Probably not flown by Bonzo the Chimp)
1974 - John Lennon, in N.Y.C. (definitely not Lucy in the Sky with Diamonds, oh wait a minute, maybe it was)
Of course, I'm not saying I don't believe in UFOs; I may have seen one when I was in military school back in 1965.