Who said "This is the most important moment in both our lives."?

This quote is attributed to Doc Brown.

This is the most important moment in both our lives. - Doc Brown

"This is the most important moment in both our lives."

Doc Brown

"This is heavy."

"There's that word again, 'heavy.' Is there something wrong with the Earth's gravitational pull in the future?"

"Great Scott!"

"If my calculations are correct, when this baby hits eighty-eight miles per hour, you're gonna see some serious shit."