mc5 - I'm not wearing any pants!

Take a familiar (or at least famous) quote (e.g. "Don't go around saying the world owes you a living. The world owes you nothing. It was here first." by Mark Twain). Then find a good stopping point (e.g. "Don't go around saying"). After this, add the phrase, "I'm not wearing any pants (e.g. ""Don't go around saying, "I'm not wearing any pants!").

Kim

Ring-a-ring o' roses
A pocket full of posies
Atishoo! Atishoo!
I'm not wearing any pants

Botherer

Marvin: I think you ought to know I'm not wearing any pants.

nyet

I, Arturo, take you, Ingrid, to be my lawfully wedded wife, to have and to hold, from this day forward I'm not wearing any pants.

Kim

To those waiting with bated breath for that favourite media catchphrase, the 'U-turn', I have only one thing to say: 'You turn if you want to. The Lady's not wearing any pants."

Raak

"Do you take this woman to be your lawful wedded wife?"
"I do not wear any pants."

Rosie

"Do you have to swagger like that, dear? You look like a builder yacking into his mobile."
"Well, I'm not wearing any pants."

Kim

Bessie Braddock: "Mister Churchill, you are drunk"
Churchill: "Madam, you are ugly, and I'm not wearing any pants". (Attrib.)