Possible Clues:

• So silly to be getting an attack
• Silly to get sick as you're on a yacht
• The fool is sick, like in a yacht
• Like what seamen are doing beginning hostilities
• Is the fool sick of anything like yachting?
• What pirates may be doing when on the high seas?
• How silly it is to get sick with such an attack coming on
• Like being in a yacht is enough to make the silly one sick