Fill it with black powder.
Primary: 2x Hard Blueberry Honey Apple Cider
Secondary: Blueberry Wheat Lite Beer
Kegged: Bavarian heavy-veisse
I threw a gourd into a fire once, and it did indeed go bang.
i think a pumpkin would plop open. Some friends and I used to sneak CO2 12 grammers into bonfires. Never even arrested, just lucky I guess...
At our homecoming game bonfire, somebody threw a couple cans of chili into the blaze. It was funny, but flying boiling chili could've hurt somebody.