Maybe other people knew this already but I found this tidbit in a magazine article (by a fellow librarian, @Ahhh Girl) about famous quotations that were first said by someone else:
"Life is what happens to you while you're busy making other plans."
John Lennon used this lyric in "Beautiful Boy (Darling Boy)." But Reader's Digest in 1957 quoted Allen Saunders, creator of the comic strip Mary Worth, as saying, "Life is what happens to us while we are making other plans."
parlance