In the pilot episode of Friends, there is a scene in Ross's apartment where he is talking to Joey and Chandler about his failed marriage with his ex-wife Carol.
Ross says that he is worried that there is only 'one woman' for each person and Joey encourages him to 'grab a spoon' - to which Ross replies: 'Do you know how long it's been since I grabbed a spoon? Do the words 'Billy don't be a hero' mean anything to you?
I have to say that the words 'Billy don't be hero' mean nothing at all to me, what is this a reference to?