OK, this one should be easy.
1. Kids are stranded on an island and find other kids that live there as a tribe
2. The teacher is killed because the tribe kids think its a monster. It was dark and he/she was holding a green glow stick or something.
3.A chubby kid finds a conch on the beach and makes it whistle ( i dont know what there called when they make sound).
4. One of the tribe kids gets jealouse of the chubby kid and pushes a boulder over a cliff and hits the chubby kid on the head and kills him.
5. One of the stranded kids finds a pig's head on a stake.