Montana is quite proud of their forest fires, they even had turnouts and "exhibit" signs by huge swaths of burned forest.
But it's the road signs that I found most amusing.
My other favorite was "Fallen Rock". I guess we need to worry about the ones already down on the ground as opposed to the city bus sized boulders that might break off the cliff, fall, and crush us as we drive by. I was driving 70 (the posted speed limit) down mountains and didn't think it wise to stop to take photos, especially with the semi's breathing down my tailpipe.