For us users that are in the USA, while I was in Arkansas this past couple of days I learned that when on US Army Corps of Engineers ran lake such as Beaver State Lake. That when yelling "Park Ranger" in order to warn your friends about him coming is a federal offense and results in a felony. Besides I was breaking the rules by drinking beer, and having a cooler full of them was against the rules. I was still surprised that it was felony for something so little. Of course though out the 4 days I was there we had another park ranger who allowed for us to jump of a cliff that clearly had a sign with "NO JUMPING OR DIVING ALLOWED" that still didn't stop me from doing it.