Whoopee! Man, that may have been a small one for Neil, but that's a long one for me.
Source, in full
After stepping down from the ladder of the Lunar Module onto a landing pad, joking about his own small stature. Source: Eric M. Jones, "That may have been a small one for Neil...", Apollo 12 Lunar Surface Journal, NASA (1995; revised 29 April 2017)