This another scene from The Once and Future King that just begged to be made into a visual.
For some backstory, you must know that King Pellinore spent a great chunk of his knighthood tracking down The Questing Beast, which was an intelligent and playful creature that possessed the head/neck of a serpent, the body of a leopard, the hind quarters of a lion, and the feet of a deer.
Later on in the book, Pellinore leaves his hunt to help out in other matters. The Q-Beast ends up tracking him. Meanwhile, Sir Palomides and Sir Grummore notice that King Pellinore is depressed after being separated from his new lady-interest. To cheer him up, they decide to masquerade as the Q-Beast in an attempt to get the king to give chase and raise his spirits.
The scenes of Grummore and Palomides discussing and constructing and testing out the costume are hilarious. As are the events that follow. Check it out!
OH, right! "Tantivy!" is apparently an old hunting cry from the Middle Ages. Fun!