Back in the early 60's, living in the rural Midwest, we burnt most of the garbage we created in a burn barrel behind the house. It was my job to do that. One day after my mom and older sisters had completed "Spring" cleaning, there was a considerable amount of garbage to be burnt. Loaded up the barrel, lit it up and went back in the house. Short time later it sounded like a war in the backyard.
My mom quickly realizing that the girls must have thrown some live ammo in the garbage, made us kids all go to the basement till long after the last "bang", fearing we might be hit by a stray bullet coming thru the house. Later when things cooled down I went out thinking the barrel would be riddled with holes. Not even a dent, even tho there was a considerable amount of empty .22 and 30-30 cases in the barrel.