Simple, any quotes that are memorable to you post here.

"What you see is what you get, I'm just a guy who loves adventure. I'M SONIC THE HEDGEHOG"
Sonic - Sonic Adventure 2

"How did you get here so fast!?"
Eggman - Sonic Unleashed

"SnooPING AS usual I see"
Robotnik - Adventures Of Sonic The Hedgehog (TV)

"I HATE THAT HEDGEHOG!!!"
Robotnik - Adventures Of Sonic The Hedgehog (TV)

Vector: Find the computer room! (Shadow the Hedgehog)


Sonic: I finally found, you faker!
Shadow: Faker? You're comparing yourself to me? Ha! You're not even good enough to be my fake!
Sonic: I'll make you eat those words! (SA2/B)

Sonic: You might know everything I'm going to do, but that's not going to help you since I know everything you're going to do! STRANGE, isn't it?! (Sonic OVA)

*Tails holding onto Sarah's chest*
Knuckles: "TAILS!!! Get OFF!!!"
Tails: *jumps off* "I'm so sorry"
Knuckles: "I never thought you'd stoop that low"
Tails and Knuckles - Sonic OVA

"Lets get ready to do this. We'll show that creep the real, super power of...TEAMWORK"
Sonic - Sonic Heroes

And let's not forget

Sonic: SHUT UP, TAILS!!! (Sonic OVA)

I really want to buy that film (but its £100!!!)

"All living things kneel before your master!!!"
Metal Sonic - Sonic Heroes

"Way to go, Knucklehead"
Sonic - Sonic Adventure

"Come on step it up"
Sonic - Super Smash Bros Brawl

"Sonics the name, speeds my game"
Sonic - Super Smash Bros Brawl

It's not quite a quote, but in one of the scenes of Sonic X that was cut out of the dub Espio steals a DVD player and leaves a note in the store that says "I will return it. Espio."

I'll have to look out for that (I'm tempted to try and pick up where I left off with Sonic X via the internet but 3 things have been stopping me. 1. Dont like Chris, 2. Dont have time, 3. I cant find them anywhere)

"Come on step it up"
Sonic - Super Smash Bros Brawl

"Too bad its all over, FOR YOU"
Sonic - Sonic Heroes

"Well talk about stubborn and full of surprises"
Sonic (seeing Shadow again) - Sonic Heroes

"Talk about low budget flights, no food or music. I'm outta here."
Sonic (escaping the GUN chopper) - Sonic Adventure 2

http://www.youtube.com/watch?v=CitWIh6FSsc Here it is!

Ahh good old Espio

"Yeah. This is happening"
Sonic - Sonic Adventure

Sonic: That was TIGHT! (Sonic and the Black Knight)

Cant believe I didnt say this one yet

Erazor: "I can't be defeated by a blue rat"
Sonic: "I TOLD YOU, I'M NOT A RAT.......I'm a Hedgehog"
Sonic and Erazor Djinn - Sonic and the secret rings

Sonic: Kids, never use Formula 1 racecars to chase hedgehogs. (Sonic X episode 1 (I think it was called Chaos Control Freaks...))

Orbot: "I think that was the wrong voice chip?"
Eggman: "Really?! Are you sure he normally doesn't speak pirate"

Sonic Colours (Wii)

Tails: They call him 'Baldy Nosehair'.

Sonic: *Laughing* Baldy Nosehair?! That's the best thing I've heard all day! I'll have to remember that one!

Tails: I already wrote it down.

(Sonic Colours - Wii)

^This.

Tails: I don't know, but what I do know is...WE ALL DID IT TOGETHER!

Eggman: you're right.

(Sonic Adventure 2 Battle)
Such a lame quote, but so much fun to say.