Take girl friend and son out side, put 1/4 teaspoon (don't need much) smokeless powder like Bullseye, Red Dot or Unique (ball powders are harder to ignite) place it in a ceramic or metal container and light it. Show her it does not explode just sort of fizzles and burns.
These people believe everything in the movies, on TV and on the net is Gospel Truth....like my daddy would say, " they eat up with a case of the screaming stupids."
I fear a stupid person's Attorney a whole lot more than the stupid person.
Gary