Doing your part to reduce the deficit

I stumbled upon a link to a page on the website of the U.S. Treasury Department's Bureau of the Public Debt.  Check it out here, (see the last question).  It turns out that we, the American people can make a contribution to reduce the national debt!  I'm mostly surprised that this is an option, and maybe a little glad that the government would make it so easy for it's citizens to take action, and I'm also hoping that nobody's actually sent a check in.