What I'd like you to do is this: Imagine that the siren has gone off and
you have only a minute to get to safety. One of our Cincinnati tonados
is coming. You can grab three shells and take them to the basement with
you.  Which three will you grab? You don't even have to answer in
public. Just think about it. Of course you may answer if you like.
Remember: these are shells from YOUR collection---not ones you wish you
had.
        The Question Man