Should have video taped it but alas I was to excited and did not.
DO AT YOUR OWN RISK!!! MUST BE 12 GaugeAlright, simple take a standard shotshell. Cut the shot out of it. Leaving just the charge and primer.
Crack a standard chem light. Shove it down the barrel, thick end first. Use a rod to seat it on the shot shell.
Aim to the sky and pull the trigger.
It worked. Didn't do awesome, but if you absolutely have to get attention at night. Why not launch a chem stick 100 feet in the air. I Know I couldn't throw that chem light as high as it went.
Looked crazy too.
*EDIT*
Looked up on YT and found a bunch of hill billy redneck retards doing the same thing.
Tell me, that won't grab a search and rescue helicopters attention!