Answer:
They took me from my mother's side where I was bravely bred and when to age I did become they did cut off my head. They gave to me some diet drink that often made me mad but it made peace between two kings and made two lovers glad.
You use a knife to slice my head and weep beside me when I am dead.
When young I am sweet in the sun. When middle-aged I make you gay. When old I am valued more than ever.
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
I have an eye but cannot see. I take time to generate and can dissipate in seconds. What am I?
What did the piece of wood say when he saw the screwdriver and screws approaching?