Fireworks were used both by Kevin McCallister and Alex Pruitt for booby traps.
Home Alone[]
When Marv checks out Kevin's house, Kevin turns on the Angels with Filthy Souls movie for the third and final time and gets out a pot and some firecrackers. When the gun firing starts, Kevin lights the firecrackers in the pot and starts booming. As the gun firing and firecrackers go off, Marv runs back to the van.
Home Alone 2: Lost in New York[]
While exploring New York, Kevin goes to a Chinese store and buys some fireworks. Later, after the Pigeon Lady throws bird seeds at the Sticky Bandits, Kevin uses the fireworks to signal the police. They arrive just in time (remarking on how it looks like the 4th of July) and arrest the Sticky Bandits.
Home Alone 3[]
Alex Pruitt goes to his snow fort and place fireworks in the fort. When Petr Beaupre was hiding in the fort from the police, the Parrot comes in and gets a match to light the fireworks. Petr tries to offer a cracker, but the parrot wanted two crackers and lights the fireworks. The parrot leaves just before the fireworks go off. The police sees the fireworks and arrest Beaupre.