I was meeting with a group of railfans (train watchers - one of my other hobbies) at a campground this past afternoon and while there I decided to place a cache. At the mention of geocaching, one of the guys looked at me funny. He told me about an incident that happened with a geocacher at a nearby railroad tunnel. I didn't believe him so I googled it and found that this one has to take the cake for trouble with police or landowners while caching:
http://www.geocaching.com/seek/cache_details.aspx?ID=21328
Briefly, for those not wanting to read all the logs, the cacher placed a geocache near the entrance to a railroad tunnel. Said cache was in an ammo box. Some cachers were observed by a member of a train crew while they were replacing the cache as a train exited the tunnel, a call was made to law enforcement, the town was alerted, the railroad and highway was shut down, the bomb squad blew up the ammo box. Apparently through the Geocaching.com lable that was on the ammo box, law enforcement tracked down the cacher who placed the cache, arrested him, charged him with Terrorism, Criminal Trespass and Criminal Vandalism (he had spraypainted a rock with the name of the cache on it). After talking with the cacher they dropped the Terrorism charge.
To quote the logs: "The sentence was then read. It goes as follows: 1 year jail time, 1 year on probation to stay out of any kind of trouble, 1 year license suspension in the state of California, and to pay all the expenses incurred for the bomb squad, the railroad having to change 2 crews out because of a 4 1/2 hour detainment and closing down of Hwy. 97. They had to taxi 2 crew men in to change shifts and 2 crew men had to be taxi'd into K.Falls and put up in a motel for the night then be taxi'd back to Redding the next day. The expense just for that was $1650.00. With all the fines and fees attatched to all of this, the grand total was $2030.00, which we had to pay right then and there. To be kind, for the moment, the judge told him he would drop the 1 year jail time. "
Unquote. It sort of makes me a bit uneasy!