Classic

I would always start laughing when he would confront those calling him chicken. He's alot like me, I do that myself.

Marty is awesome!!!

I like that one and 'heavy' both are so cool

MARTY: Whoa,this is heavy.
DOC: There's that word again;"heavy". Why are things so heavy in the future? Is there a problem with the earth's gravitational pull?

This line still cracks me up silly every time I see the movie!

heh heh! this guy is so stupid and funny!!

i can't remember his name, though.

Biff!^^^ HAha he was a dork,eh?!!

i knew it was something like that! you got that right, he was hilariously dorky!!

its not "heavy" its "this is heavy"

have you heard it in spanish? it's wierd, but funny!

there's so many good ones, so hard to chose just one....

Awww, I love this one, lol. Poor George was so cute. <3

Great Scott! came close but "Say Hi to your mom/Grandma for me" always makes me laugh.

actually my fav line is "When this baby gets up to 88mph, your going to see some serious shit"

'Great Scott!' funny!

It's between this, nobody calls me chicken, and make like a tree and get out of here lol

by far

i love it when Marty says that!!

along with
MARTY: Whoa,this is heavy.
DOC: There's that word again;"heavy". Why are things so heavy in the future? Is there a problem with the earth's gravitational pull?

GEORGE MCFLY: "Last night, Darth Vader came down from planet Vulcan and told me that if I didn't take Lorraine out that he'd melt my brain."

BIFF: Now why dont you make like a tree and get out a here!

when Marty says nobody calls me chicken i just cringe that line always brings trouble..

The full line(thanks to some asinine cutoff point) is "If my calculations are correct, when this baby hits 88mph you're gonna see some serious shit!" Best line of all time. There's a car in Forza Motorsport 3 that goes about 100mph tops, so it'd be perfect for this line.

Nobody...calls me a chicken! my favourite

You are speaking to a true Glover fan right here

This and "I'm George, George McFly. I'm your density. I mean... your destiny".

Love this, 'that's heavy' and "I'm George, George McFly. I'm your density. i mean... your destiny."

Also "Heavy" and "I'm George, George McFly. I'm your density. I mean... your destiny".

I always laugh when he said that to Lorraine I also love "Great Scott" and "if my calculations are correct, when this baby hits 88mph your gonna see some serious s"

I chose this one because of the more greater meaning to this specific day. All the others are good but this one supersedes them all because of the occasion. As today it is Wednesday 21'st October 2015 and it was the first time we see Hill Valley in 2015.

Great Scott!!!