Barnegat, NJ schools were put into "lockdown" because someone saw a "ninja" (turned out to be a camp counselor in a karate uniform going to a costume party). Lesson learned by students: security alerts are bogus, grownups are idiots.
Public schools in Barnegat were locked down briefly after someone reported seeing a ninja running through the woods behind an elementary school.
Turns out the ninja was actually a camp counselor dressed in black karate garb and carrying a plastic sword.
(via Schneier)