http://www.gordon.army.mil/tsc/DEVICES/new%20devices/New%20Devices%20Browser/images/FGD-09-1862(B).jpg
If you see a soda can, look out! Soda cans have been used as IEDs in Iraq and in Afghanistan, and American casualties have resulted from their detonation. There is a wire on this one because it's command detonated, but a soda can IED could have a timer or radio trigger, or be set to explode when moved or kicked.
If you observe a soda can in an area where people pass by or congregate, or unattended in a food court, contact authorities immediately. Do not attempt to move or defuse the device yourself. Calmly advise everyone in the area to leave quietly until the bomb squad has cleared the device.
A soda can without an explosive or timer may be a hoax device intended to frighten you, so do not panic when you see a soda can. But it may not be a hoax- act responsibly!
http://www.globalsecurity.org/military/intro/images/ied-iraq_soda-can.jpg
"..so do not panic when you see a soda can.." Ding, Ding - We have a winner. I'm just astounded by the reactions on a supposedly 'conservative' site. Your comment hits the paranoia nail on the head, but you are surely going to get flamed. We gotta watch out for the children, don'tcha know.