Back in 2002, science fiction author Robert J. Sawyer wrote an essay about the
trade-off between privacy and security, and came out in favor of less
privacy...

    Whenever I visit a tourist attraction that has a guest register, I always
    sign it. After all, you never know when you'll need an alibi.

Since I read that, whenever I see a tourist attraction with a guest register, I
do the same thing. I sign "Robert J. Sawyer, Toronto, ON" -- because you never
know when he'll need an alibi.

	-- http://www.schneier.com/blog/archives/2009/09/robert_sawyers.html