Several years ago, I used an X-acto knife to cut a hole in an egg. I filled the shell with isopropyl alcohol. (Careful, kids, this device is almost 90% pure divorcium.)
Mark insisted that I not set the house on fire or display this for The Child, so it was in the back part of the yard. Then I lit it. Of course I had a camera, so I spent the next two hours (while the summer sun set) photographing it.