Boat

To reach a port we must set sail --

Sail, not tie at anchor

Sail, not drift.

~ Franklin D. Roosevelt

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If I were a boat, I think a sailboat would be a nice kind of boat to be. 
I wouldn't be a submarine.
I wouldn't be a rowboat.
I wouldn't be a tugboat.

Unless it was because this poem is so cute that it sort of tugs at your heartstrings.

(pause)

I'd be a tugboat.