I Remember...

[Jemisa]

Neil Armstrong lands on the Moon and says the words: "Over to you, Gretsky." Everyone's confused and asks him what does he mean but he refuses to reveal it.
However, he's at a 20-year reunion for the Moon landing and he's asked once again: "Why did you say, 'Over to you, Gretsky'?" "Well," he says,

"when I was a young boy I used to live next door to an old couple called the Gretskys. They always argued, and his wife I remember shouted to him: "The only time you'll get oral sex is when man walks on the Moon."

[excelsior-1]

one giant s*** for mankind

[Old_Geezer]

An urban myth rather than a joke, but amusing.