Let’s see, vacuumed the toilet out twice, slinky in the electrical outlet, gunpowder manufacturing, melting lead, riding in the back of the pickup, no seatbelts, homemade hydrogen, etc.
Melting lead? How about a chemistry set with mercury and lead in them? I got it for Christmas...my brother got an electronic set from Radio Shack the same year... and we try to see what lead mercury and electronics can do together...