
Carrots
Carrots also work, but then this is how you fool those fingerprint scanners that use the capacitive screens, the ones that (according to one J Smith) can't be fooled by dead fingers or plastic fingers:
http://forums.theregister.co.uk/forum/1/2009/08/14/biometric_id_delusion/#c_560783
"You still see politicians claiming that a stock chinese touch panel can tell the difference between a dead finger cut off a body and a live finger.....they don't know about capacitance screens even! (Try operating your iPod with a plastic pen, doesn't work, now try with a carrot... works, that's a capacitive screen, the juicy carrot and your body form one plate of a capacitor)."