Who said "I've calculated every variable. This will work."?

This quote is attributed to Doc Brown.

I've calculated every variable. This will work. - Doc Brown

"I've calculated every variable. This will work."

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."