This is a conversation between our nephew Matthew(M) and his swimming instructor(SI).
SI: "Okay, boys and girls, who can tell me a pool rule? . . . . Matthew can you tell me a pool rule?"
M: "Yeh, . . . . No eating sandwiches in the pool"
SI: "Okay Matthew, why wouldn't you eat in the pool"
Now, why wouldn't one eat in a pool, what would be the logical answer to this question, because Matthew has it . . .
M: "Because you don't want your sandwich to get wet"
And there you have it. Remember, to keep it dry, don't take it in the pool.