Marty, this is the one part of the past that bothers me. If ... - Dr. Emmett Brown

"Marty, this is the one part of the past that bothers me. If we tamper with it, we could alter the present."

Dr. Emmett Brown Truth

More from Dr. Emmett Brown

"Great Scott!"

"This is heavy."

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

"If my calculations are correct, when this baby hits 88 miles per hour, you're gonna see some serious shit."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."