The Pythons, of course, are the Brits who gave us Monty Python's Flying Circus and a string of movies including Monty Python and the Holy Grail (1975), Monty Python's Life of Brian (1979) and Monty Python's The Meaning of Life (1983).
And while there may not be a "punch line scheduled," the date for next year's observance is. More info here.
Selecting just one Python quote can be tough. But here are a few standards to get the circus started:
“Tis but a scratch'' A scratch?" "Your arm's off!'' No, it isn't.
“I don't think there's a punch-line scheduled, is there?”
“'What? Ridden on a horse?'' Yes. ''You're using coconuts!'' What? ''You've got two empty halves of coconuts and you're banging them together!'' So?
“Tonight, instead of discussing the existence or non- existence of God, they have decided to fight for it”
“First you must find... another shrubbery! (dramatic chord) Then, when you have found the shrubbery, you must place it here, beside this shrubbery, only slightly higher so you get a two layer effect with a little path running down the middle. ("A path! A path!") Then, you must cut down the mightiest tree in the forrest... with... a herring!”
“Your highness, when I said that you are like a stream of bat's piss, I only mean that you shine out like a shaft of gold when all around it is dark”
“My philosophy, like color television, is all there in black and white”
“Strange women lying in ponds distributing swords is no basis for a system of government!”
“She turned me into a newt!" "A newt?""I got better...”
“It's funny, isn't it? How your best friend can just blow up like that?”
“We are no longer the knights who say ni! We are now the knights who say ekki-ekki-ekki-pitang-zoom-boing!”