Black Comedy to Warm The Soul(tm)
A pretty solid introduction to everyone's favourite pyromaniac, whose final punchline is equal parts karmic, ironic, and pitch-blacl. Seems this kid's pretty knowledgeable about explosives, too.
The mention of ammonium nitrate suggests to me there was some minor inspiration from the Oklahoma City bombing, whose perp used a Ryder truck full of ANFO to carry out the attack.