An event like the inauguration is a great excuse for the FBI to roll out all of its super-expensive security gear, like a truck you can explode a live bomb in without hurting anyone.
New Scientist has a full gallery, but my favourite is definitely the aforementioned truck. The Bomb Containment Vessel can be used to transport a live bomb safely, and it's strong enough to have the bomb explode in its belly if need be. It won't be used, in all likelihood, but it sure is fun to know it's there. [New Scientist via Dvice]