Narrative Cohesion

Today with the 1st grade, the teacher handed everyone pictures (that they'd previously colored) and wanted them to tell a story about them. So the first person said something about his picture, and the second person was supposed to continue the story with something about his picture. It sounds good except that the pictures have no relation to each other, other than being Halloween-themed, not to mention the fact that all of the children are six years old.

Kid 1 (has picture of devil): Once upon a time there was a devil.
Teacher: Good! OK... next--
Kid 2 (has picture of chimney): And the devil went to a house and went down the chimney and was in a fire...
Kid 3 (picture of Zombie): AND THERE WAS A ZOMBIE!!! (note: in Castilian, Zombie is pronounced THOMBI) AND HE MET THE DEVIL! And then they went next door, to a house, and there was a girl, and her father, and then the father had a knife and he got out the knife and...
Teacher: OK! OK! Next person!
Kid 4 (picture of a Witch): And then a witch came along and said "HEE HEE HEE!! Drink this potion! It will make you very strong!" And the zombie and the devil drank the potion...
Kid 5 (picture of Vampire): Then a Vampire came along and BIT the Witch....
Kid 6 (picture of House): Then they went to the Witch's house.
Teacher: After he bit her, they went to her house?
Kid 6: Well he took her to his house.
(OK...?)
Kid 7 (picture of ghost): And then a ghost came and there was another vampire and the vampire bit it
Kid 8 (picture of a door): Then there was a knock at the door. KNOCK! KNOCK! It was another Vampire. He pushed at the door... EEEEE...
Kid 9 (picture of candy): And another vampire came in and they decided to eat this candy, but when they did, fists came out and punched them. Pow! Pow!
Kid 10: (incoherent rambling about another witch and another vampire)
Kid 11 (picture of a scary tree with a face): Then they went out to the garden. And there was this tree with four arms. And he caught the four vampires, two witches, the zombie, the ghost, the devil, the girl and her father, and ate them all.