[SmG Batman]

Almost every line from Joker in the Dark Knight  
Do I look like a guy with a plan? 
EVERYTHING burns!
If you're good at something, never do It for free?
I believe, whatever doesn't kill you, makes you stronger? 
And finally, 
Why so serious?

[SmG Aspire]

When Groot shielded all of the guardians when their plane crashes and he says "We are groot"

[«SmG» Rooma]

Best line is " I am Groot "

[SmG Batman]

When Groot shielded all of the guardians when their plane crashes and he says "We are groot"

That is one of the best too. I agree! Gotta love Groot. :-3

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Best line is " I am Groot "

Bet it ain't better than, "I'm Batmannn" line though XD 

Groot needs its own movie on a serious note though. O_O

[SmG Drazzle]

"Why.. So... SERIOUS?

[Valentina]

My favorite line is from wonder woman, which is:
Diana Prince: I used to want to save the world. To end war and bring peace to mankind. But then, I glimpsed the darkness that lives within their light. I learned that inside every one of them, there will always be both. The choice each must make for themselves - something no hero will ever defeat. I've touched the darkness that lives in between the light. Seen the worst of this world, and the best. Seen the terrible things men do to each other in the name of hatred, and the lengths they'll go to for love. Now I know. Only LOVE can save this world. So I stay. I fight, and I give... for the world I know can be. This is my mission, now. Forever.