The key is the Key

I went to see the sea one day, And saw a whale of a tale. A knight in shining armor rode A horse that had no tail. He said he came from Camelot To find the Holy Grail. But on his quest he got so lost He ended up in jail. He asked me for some bail or kale To help him get set free. I said I had no cash or greens But I could brew some tea. He said he liked his tea with cream And honey from a bee. I said I had no dairy or sweets But I could find a key. I searched the beach for hours and hours But found no key or quay. I gave up and returned to him And said I had to flee. He begged me not to leave him there And started to plead or plead. I said I'm sorry for your plight But I have to go and pee.