The rule of thumb on a boat is “one hand for the boat and one hand for yourself.” Sounds like good advice but in practice it doesn’t work. More often than not, you have to trim that genoa, adjust that lazy jack, hoist that curtesy flag … with one hand? Forget it.
What you need is a third hand that you don’t have unless you’re Zaphod Beeblebrox. So you grab that sheet with you teeth to keep it from falling in the water or secure the flag hoisting line when attaching the yellow quarantine pennant. Remember, when Caribbean pirates boarded a hapless merchant vessel, they always took their knives between their teeth.
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