Peabody's wife: [Upon seeing the DeLorean] Lord, what is it, what is it, Paw?
Old Man Peabody: Looks like a airplane... without wings!
Sherman Peabody: That ain't no airplane. Look! [shows father "Tales from Space" comic book]
Old Man Peabody: Looks like a airplane... without wings!
Sherman Peabody: That ain't no airplane. Look! [shows father "Tales from Space" comic book]
Peabody's wife : [Upon seeing the DeLorean] Lord, what is it, what is it, Paw?
Old Man Peabody : Looks like a airplane... without wings!
Sherman Peabody : That ain't no airplane. Look! [shows father "Tales from Space" comic book]
http://www.moviequotedb.com/movies/back-to-the-future/quote_2672.html