If you could go back to any time, with any ONE modern technology

[Toaster Hunter]

The battle of Thermopylae with a P90 and a few dozen frag grenades. Just for a twist, fight on the Persian side, just to see how history would change.

 

[Aptspire]

WW2 with an Unlimited ammo B-2 (or F-22)
and some Bunker Buster bombs

 

[The Infinite]

M-1 Abrams with unlimited ammo and gas and face off against the mongol army of Genghis Khan. Your elephants aren't going to help you now!

Edit: Wait scratch I'd rather battle in medieval England. Yeah I know its a rather popular destination but hey I thought bigger than just a boomstick. XP

 

[Eclectic Dreck]

Honestly, I'd probably go back in time and give keppler or mercader calculus. This would push our understanding of science (and as such presumably the technology we have available now) by hundreds of years.

 

[xDarc]

I would go back to 2009 with the holo tapes I stole from president-for-life Obama's personal safe. Oh shit... you saw nothing! *vanishes*

 

[shotgunbob]

Id go back with a Aircraft Carrier and stop Pearl Harbor

Oh wait....

 

[Walkchalk]

A history book so that I may be hailed as an all knowing prophet or seer of some kind.

 

[truheGrnn]

I will take the time machine and become emperor of the world with the blueprints for the AK-47(would that make me a dictator?)....or end up shaking my own hand in the past creating a paradox and killing us all which begs the question, which me got to shake my hand first?

 

[steevee]

Hmmmm..... Thats a tie between the 1700's with a comprehensive journal of medicine

and

1970 with a list of all the winning lottery numbers up to the present day, and f course the knowledge of, 'Invest in computers'

 

[Skuffyshootster]

Gladiator era Rome, with a Smith and Wesson Model 500 and a wagon full of ammo.

Let's see how effective your blade arm [http://piezaapieza.net/images/PEG54119.01.jpg] is now.

 

[Jark212]

M-1 Abrams with unlimited ammo and gas and face off against the mongol army of Genghis Khan. Your elephants aren't going to help you now!

Edit: Wait scratch I'd rather battle in medieval England. Yeah I know its a rather popular destination but hey I thought bigger than just a boomstick. XP

Beat me to it...

M1-A2 Abrams
Sell it to the US government 1941, it has modern armor, weapons, jet-turbine engine, modern computer system, NBC protection... I'd sell it for a billion, which is worth a lot more then today's currency...

 

[Sephychu]

I'd go back to the dawn of time with my PS3 taped to an HD TV(clearly one object), and draw power from nebulae. Then I'd get some peace and hopefully become the core of a planet or something.

 

[Dark Knifer]

I'd bring a eurofighter typhoon.

Fear me!

 

[Obrien Xp]

Mess up WWII with modern tech. Or an AK-47 anywhere in the past.

 

[Go Fighting In The War Room]

A Time Machine. To right before the election of the Nazis. (Yes they we're elected)

"Hey! I'm the messenger of god! The election of these guys..... would not go well with him... If you elect these guys when I come back.... you're in trouble..."

Come back to present, and return 1 year after I first arrived with an AC-130.

If they didn't do it, I rule with an Iron Fist via, Gunship.
If they did, See Above.

 

[dont_blink]

i'd bring my sonic screwdriver, as always

 

[CNKFan]

I'd go to ye olde Ireland with like machine guns to stop the British from fucking with it.

 

[UltimateZ]

I'd go back in time to when the Great Wall of China was built and give the Mongols a wrecking ball, just for shits and giggles.

 

[MR T3D]

myriad of modern medicines around 1900, including cures for polio, etc. and save a few MILLION lives.