When I was in grade school, I accidentally burned down my neighbor’s fence in Vallejo CA. Yeah, their fence. The year before my brother burned out the entire vacant area behind our neighborhood in Benbrook TX.
When I was in HS(a long time ago)my brother and I caught a neighbor's(or actually THE neighbor, only one we had)yard on fire, using a home made black powder fire cracker, burned some of his fence posts(he had a barbed wire fence)and most of his two acres of grass, but the worse thing was we caught his fire wood pile on fire and burned about 1/2 cord of Oak before we finally put the fire out.
Lesson learned: Black powder and dried grass in 100 degree heat in July do not mix. He was gone at the time and the terrible thing about it(after the beatings administered by my mother)was we had to go to his house and explain to him how stupid we were and apologize. He was a great guy and kind of laughed about it. In today's world I am sure we would have gone to jail for such a prank.