According to Penny and Amos in this thread:

Spike Milligan, parody,

I must go down to the sea again, to the lonely sea and the sky,
I left my shoes and socks there, I wonder if they're dry.

Penny

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For the sand of the seas gets between your toes
And the salt sea wets your stockings
So I must return where the long tide flows
Just to check -- nope, they're still sopping!

A