"Freedom is the right of all—"
"Oh, shut up."
-Optimus and Megatron, All Hail Megatron


"The average Autobot default setting is daredevil, maverick. That's not us, Perceptor. We can subdivide this war into its purest mathematical form and generate solutions all we want, but unless we happen to be surfing on a meteoroid at the time, no one will pay attention."
-Prowl telling it like it is, All Hail Megatron

 

Best line of all time...

[Megatron thwarts Starscreams attempt to kill him, once again. Starscream tries to blame it on the triple changers. Megatron then has Starscream in a position to kill him once and for all for his treasonous acts]

Megatron: You're either LYING or your STUPID.

Starscream: I'M STUPID! I'M STUPID!

Now that's great writing  

 

" D'you realize who I am?
I'm the autobot who lands the final punch. I'm the autobot who leaves you twitching in the dust. I'm the autobot who decides whether you live or die. I'm a force of nature. An apocalypse on legs. A brutal symphony of sound and fury."-Whirl

"Whirl's life lesson number 3: if all else fails, ask Brainstorm to build you a weapon."-Whirl

"What is this a therapy session? Because I've been tricked like that before." Whirl

 

"Metroplex heeds the call of the last prime"
-anonymous

 

"Strategy is for cowards!"
--Galvatron, "Webworld"

"Mercy. How quaint. I see no victories sired in the niceties of mercy. Mercy is the maxim of the weak, the final plea in a victim's eyes, the final gasps in their dying breaths."
—Beast Era Megatron, Singularity Ablyss

"Splendor, to me, is perfect order. Programs designed with such finesse that no subroutine contains a single byte of extraneous code. Splendor is a billion soldiers storming a planet as a single unit. Splendor is a mountain comprised of fallen foes. Splendor is power."
—Beast Era Megatron, Singularity Ablyss

"And in an instant that lasts a thousand eons, I learn that there is indeed something more satisfying than the howl of a dying beast: the death scream of an angel."
—Beast Era Megatron, Singularity Ablyss

"I have forged this entire planet into a single elegant machine--a vision of technological purity and order."
—Beast Era Megatron, "Master of the House"

 

I find your bargaining posture highly dubious (1986 Movie)

No-one wants to hear about your latest midlife crisis (Dark Cybertron Finale)

 

Speech this.

*POW*

EDIT: Oh darn, that Leemaster beat me to it  

 

I am Astrotrain,mightiest of all the gods. Fall down and worship your new master worms.From this day forward,all who defy me die!

 

"You are guilty of the one unforgivable crime: Failure!"
-Megatron in Transformers the Video Game 2007 DS Decepticon Version.

"Say goodbye to the universe, Maximals! The future has changed. Yessssss. The Autobots lose, evil triumphs, and you... YOU NO LONGER EXIST!"
-Beast Megatron

 

Right Right Right mega mega megatron - G1 Mixmaster
busted out laughing when I heard that one growing up...

 

"This is Abdul Fakkadi, Supreme Military Commander, President-for-Life, and King of Kings of the Socialist Democratic Federated Republic of Carbombya."

Five Faces of Darkness - Part 1.

 

Megatron. But you can call me... death.
-Swerve

The next one is a bit long but still coo.

My friend's name was Megatron, and he had three questions! Three things he said you should demand to know of any powerful institution.

Question one: In whose interest do you exercise your power?
Question two: To whom are you-just let me finish-to whom are you accountable?
And three-oof! And three! How can we get rid of you!

-Optimus Prime/Orion Pax

 

Since we're doing this thread again (no offense, The Soundwave):

"This is bad comedy."
"Then it pleases me to be the first."

 

"Lord Starscream will want to know about th-"
"Starscream can blow it out his exhaust! Once we get Megatron back, we won't need Starscream anymore."
"And what makes you so sure Megatron's such a better leader than Starscream?"
"Because Starscream's the kind of coward who'd kill you in your sleep. Megatron would have the ball bearings to do it to your face."
- Create-A-Con and Barricade, the 07 DS Decepticon game.

"Press L3 to silence Megatron."
"Press R3 to shut up Starscream."
- Fall of Cybertron's commands.

"You and your beast would do well to remember: I honed my skills in the pits of Kaon!!"
- Megatron

"The ponies are easily the most menacing ones in that picture."
- Derrick J. Wyatt reacting to a panel of Ratchet's Hatch's Cyberversal funnie, in which the Decepticons and Ponies mobilize to attack the Autobots.

 

"And nothing!" - Unicron

 

"Shiver you're own timbers." - Heatwave

"Impossible! Our laserfire is just making him stronger!" - Swerve

 

"Ratchet, could you put his brain back in his head? With corpses, I prefer to go through the eye sockets."

"I cannot begin to tell you what's wrong with that sentence."

"Wreckers combine! Well I thought it was funny!"

"Wreckers. There's a difference."
"Not really - you all make the same whimpering sound when you die."

"As leader of the Autobots my directives tell me that loss of soldiers is inevitable. That if I lead soldiers into battle, I must be prepared to lose some along the way. That with war comes great sacrifice. But what my directives DON'T tell me...what they can NEVER prepare me for... is just how much it hurts. EVERY TIME."

"Me? No, no, no, I'm all mouth. My nickname at the academy was "shut the hell up.""

"I am Predaking. The greatest hunting machine in the galaxy and you little robot are my prey."
"I am no one's prey. I am Megatron the Conqueror!"

 

From G1 movie:

"Nobody summons, Megatron!"--Megatron

"Then, it pleases me to be the first." --Unicron

"Why throw away your life so recklessly?"-- Megatron

Optimus rises up like a badass: "That's a question you should ask yourself."


From G1 MTMTE:

"You destroy everything you touch, Megatron."-- Optimus

"Because everything is food. Food for my hunger."-- Megatron