For demonstration purposes: Do not try this at home.
I will be utilizing two chemical reactions known as a double replacement reaction and combustion reaction for this demonstration. My start material is known as calcium carbide, a laboratory produced compound that was commonly used by miners in their hand lamps and at one time used as a headlights in automobiles. Calcium carbide reacts with water to produce acetylene gas (the double replacement reaction). When ignited, acetylene gas produces two gases: carbon dioxide and water (the combustion reaction). This increased production of gases inside the pumpkin forces the pieces of the pumpkin to explode off making for a unique and fun approach to pumpkin carving.
Courtesy: Chemical Kim, www.chemicalkim.com