This comes from a clip from the Holy Grail. I highly recommend Killer Rabbit and The Black Knight. They are freaking hilarious.

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Optimus: *is going into an energon mine*

Vehicon: *gets in the way* *scary voice* None shall pass!

Optimus: I am coming in.

Vehicon: *pulls out a sword* Then you shall die.

Optimus: So be it! *pulls out sword*

*they start fighting*

*lots of badaft fencing skillz*

Optimus: *manages to cut off vehicon's arm* HAHA! The fight is mine. Stand down.

Vehicon: I shall not! 'Tis but a scratch!

Optimus: ...A scratch? Your arm's off! It's right there on the floor!

Vehicon: I've had worse.

Optimus: Liar!

Vehicon: *grabs sword in other hand and starts fighting again* I never lose!!!

Optimus: *cuts off his other arm* There. You've been defeated. Now stand down.

Vehicon: It's just a flesh wound.

Optimus: .... you are indeed brave, but the fight is mine. Stand down.

Vehicon: *starts kicking him* Chicken! Chicken! *chicken noises*

Optimus: ....

Vehicon: *keeps kicking him*

Optimus: *sighs* Fine. *cuts off the leg he was being kicked with*

Vehicon: *hops on one foot* I'll kill you for that!

Optimus: What are you going to do, bleed on me?

Vehicon: *starts headbutting* I'M INVINCIBLE!

Optimus: *looks agitated*

Vehicon: *keeps headbutting*

Optimus: *cuts off his other leg*

Vehicon: *Sits on the two stumps left* ..... Alright, we'll call it a draw.

Optimus: *walks into mine*

Vehicon: GET BACK HERE AND FIGHT ME LIKE A MAN! I'LL BITE YOUR LEGS OFF!

Optimus: Fragging kill me...

Watch the video.