Please answer the following question: Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: Why is Shanghai Sam upset? Title: Mutiny On The Bunny Movie plot: In 18th-century England, the triple-masted schooner the "Sad Sack" (formerly the "Jolly Roger") sits at the docks. Yosemite Sam's former crew member, a haggard, traumatized, disheveled man, escapes after stating to the audience: "I was a human being, once...". "Shanghai Sam" is ready to sail at high tide and needs a new crew. Seeing Bugs Bunny, Sam quickly puts up signs for a fake free trip around the world. On board, Bugs waves goodbye to a cheering crowd (which is nothing but a mouse), and is knocked out when Sam conks him over the head. Bugs finds himself rowing the ship's oars with an iron ball chained to his foot. He storms up to Sam and demands he gets rid of it. Sam shrugs and chucks the iron ball, plus Bugs, overboard. Bugs storms up to Sam again (without the iron ball) and demands an explanation, but Sam orders Bugs to swab the deck. A short argument ends with Bugs mopping the deck. As payback, Bugs scrawls insults on the deck ("The Captain's wife wears Army shoes", "The Captain loves Gravel Gertie", "The Captain is a shnook"), which Sam angrily scrubs off. Bugs smugly compliments Sam on "keeping your ship so spic and span." Realizing he's been tricked, Sam points a pistol at Bugs. Bugs immediately tricks Sam into thinking that the ship is sinking. Sam jumps into the lifeboat, but Bugs pulls him out and reminds him: "The Captain goes down with his ship". Sam instantly resigns and makes Bugs the captain. After an argument, he accepts; but when Sam gets back on the lifeboat, Bugs pulls him out again to remind him "Women and children first." Sam disguises himself as a panicking hysterical old lady in need of rescuing. Bugs puts Sam in the lifeboat and drops it into the water. Just as Sam starts to row away, Bugs calls him back and throws him the ship's anchor dressed as a baby, sinking Sam and his lifeboat. Back on the ship, Sam discovers Bugs with some digging tools. Bugs explains that he is going to dig for buried treasure. Sam snatches the map follows its clues to an "X" in the ship's hold. He starts...
A:
Bugs writes insults on the deck.