the bo'sun sprays us off one last time to get rid of the soap and warns us to stay clean or next time he 'll tie a line around our ankles and keelhaul us and wo n't that scrub our nasty little hides clean , bouncin ' along the barnacle-covered bottom of the ship till we 're pulled up on the other side , maybe drownded , maybe dead , maybe not , but bloody and clean for certain .