PROBABLY NOT AN ORIGINAL POST

But after reading this...

Paul Ryan to Obama on Medicare debate: Bring it on

I almost immediately thought of a Monty Python & the Holy Grail scene (IMDB & here):

King Arthur: [after Arthur's cut off both of the Black Knight's arms] Look, you stupid Bastard. You've got no arms left.
Black Knight: Yes I have.
King Arthur: *Look*!
Black Knight: It's just a flesh wound.
ARTHUR: Look, stop that.
BLACK KNIGHT: Chicken! Chicken!
ARTHUR: Look, I'll have your leg. Right!
[whop]
BLACK KNIGHT: Right, I'll do you for that!
ARTHUR: You'll what?
BLACK KNIGHT: Come 'ere!
ARTHUR: What are you going to do, bleed on me?
BLACK KNIGHT: I'm invincible!
ARTHUR: You're a loony.
BLACK KNIGHT: The Black Knight always triumphs!
Have at you! Come on then.
[whop]
[ARTHUR chops the BLACK KNIGHT's other leg off]
BLACK KNIGHT: All right; we'll call it a draw.

INTERPRETIVE HINT: Pres. Obama is King Arthur