A brief video with detailed technique on defeating biometric sensors. In German, but I think everyone will get the gist of it. You need a digital camera, PC, printer, overhead projector acetate sheets, and ordinary white Elmer's or woodworking glue, and a plastic dowel or glass rod. Fun for the whole family!
This technique works — I've seen a live demonstration!
Courtesy of the chaos computer club berlin, ccc.org