Just saw in the Where's George threads where a Bomb Squad in Az supposedly recently "detonated" a cache due to onlookers concerns it contained a bomb.
I know I actually had a cacher who was searching for one of mine (Redwings Treasure) and parked in a residential area no where near the cache and entered the park it was in from the back side.
Residents called the police saying they saw him and his partner get out of the car and enter the wooded area with a gun. They (police) were waiting when he returned to his car only to find out the supposed gun he was holding in his extended hand was his GPS.
I'd like to point out that this one happened prior to the 9/11/01 attacks. Some people just panic easily and it will only get worse now.
Again, with everyones hightened "Panic" level due to current events, Please be sure to mark the outside of this type of container very plain and visible.