If you've been paying attention, you know that it is currently not uncommon for people to be arrested because of anti-Bush signs.

Update, jan2007: Jeff W. writes:

Subject: Reacting to your web-page
Date: Fri, 9 Feb 2007
From: Jeff W.

When has anyone been arrested for posting an anti-bush sign?

http://www.google.com/search?q=arrested+%22anti-bush