the main story
The theme for the final day of Vacation Bible School is "God empowers us". The story is Pentecost.The disciples were in hiding when Jesus appeared to them saying God would send them a gift. Later, they were still in hiding, and the Holy Spirit descended upon them. The disciples could speak in different languages. They could tell the world about what they have seen and heard. God gave them the Holy Spirit so they could spread His Word. The activity this day shows this in a very shocking way.
The activity is putting Mentos in soda. Coke Zero has the best reaction out of all the sodas. We are the soda. God, Jesus, and the Holy Spirit are the Mentos. When the Mentos are added, the soda shoots out of the soda bottle. This is us being empowered.