Warp wrote:
>   Yes, but couldn't they have chosen a gesture which is *not* commonly used
> for "everything's fine" in other situations?

Well, in addition, thumbs down means go deeper. So it's nicely symetrical. 
Maybe two-fingers-up vs two-fingers-down would have made more sense, tho.

I'm more amused by some of the standard signs for underwater wildlife, myself.

-- 
   Darren New, San Diego CA, USA (PST)
   I ordered stamps from Zazzle that read "Place Stamp Here".

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