Possible Clues:

• It's silly of you to be sick, like when you're in a yacht
• Like being in a yacht has the fool feeling sick
• While on the water, launching an attack
• Like being on a yacht where it's silly to get sick
• How foolish one is to be getting sick as one is in a yacht!
• What the attack is doing is making 17 across sick, it seems
• Having such an attack is enough to make the silly sick
• Having such an attack makes one so silly and sick
• Like being on the sea if it's storming
• Silly to get so sick as a result of an attack