“Some people see things that are and ask, Why?
Some people dream of things that never were and ask, Why not?
Some people have to go to work and don't have time for all that.”

Though Kennedy stated that he was quoting George Bernard Shaw when he said this, he is often thought to have originated the expression, which actually paraphrases a line delivered by the Serpent in Shaw's play Back To Methuselah: “You see things; and you say, ‘Why?’ But I dream things that never were; and I say, ‘Why not?’". This phrase was first used by his brother John F. Kennedy in 1963 (June 28th), during his visit to Ireland, in his address to the Irish Dail (Government): "George Bernard Shaw, speaking as an Irishman, summed up an approach to life, 'Other people, he said, see things and say why? But I dream things that never were and I say, why not?" ( Address on YouTube https://www.youtube.com/watch?v=8ADeazX9blw.). Robert's other brother Edward famously quoted it (paraphrasing it even further), to conclude his eulogy to his late brother after his assassination (8 June 1968): Some men see things as they are and say why? I dream things that never were and say why not? - (Eulogy in CBS news video) http://www.cbsnews.com/video/watch/?id=5268061n
Misattributed
Source: Robert Kennedy in His Own Words: The Unpublished Recollections of the Kennedy Years

Metro Weekly interview (2006)
Context: Listen, I have no judgment about anything. Some people will bring certain celebrities up to me who are presumably — or known to be — gay and ask "Why don't they come out?" But we don't know why they don't, and it's none of our business, really. In '75 I was making the Modern Scream album, and Jane and I were in the studio. My publicist called me and said "Time will give you the cover if you'll come out." I was more offended than anything that they thought we'd make a deal. But that was '75 — it would have been a hard thing to do at that time.

Source: Play It as It Lays

Introduction
Infidel (2007)

Adverbs (2006), Particularly

Interview by Brendan Maher http://www.gottfried-helnwein-interview.com/index.html, Start, Ireland, November 24, 2004
Context: When I started to paint, I painted children because I just felt that I wanted to take their side. What always upset me was how children are getting abused simply because they are physically weaker and not capable of defending themselves – how they get raped, enslaved and killed. I never understood why some people seemed to have fun causing pain to someone smaller.

Source: Cold Mountain

Source: For the Win