Putting salt in the sugar bowl is a classic. It's simple but can lead to some really funny reactions when someone tries to sweeten their coffee or tea.
They can use creative disguises. For example, dressing up as a spooky ghost to scare the other kids during the prank war. It adds an element of surprise.
The plot could involve two groups of rival kids constantly trying to out - prank each other. Maybe they start with simple tricks like swapping salt and sugar at each other's homes. Then it escalates to more elaborate pranks, like setting up a fake haunted house in one of the kid's backyards to scare the other group. Along the way, they learn valuable lessons about friendship and respect, despite their rivalry.
The main characters could be two best friends who have a falling out and turn into rivals. Let's say Tom and Jerry (not the cartoon characters, just using these names). Tom might be the more mischievous one who starts the prank war, and Jerry, who is usually more laid - back, gets drawn into it and decides to fight back. There could also be their sidekicks, like Tom's younger brother who helps him come up with prank ideas, and Jerry's neighbor who provides the supplies for the pranks.
The most memorable prank was when James Potter made Snape's robes turn into a ballgown during a school assembly. It was so unexpected and embarrassing for Snape, and everyone in the Great Hall couldn't stop laughing.
If there's a novel with such elements, the gross prank war might be used to show the wild and unruly nature of the characters. And the roach burrito? Well, that could be a symbol of the nastiness or chaos in their lives. It could also be a form of extreme prank within the story.
The creativity of the pranks. A good prank war novel has pranks that are unique and clever. Like using scientific principles in a prank or coming up with a prank that involves an elaborate ruse that takes days to set up. This makes the story interesting as readers are eager to see what the next crazy prank will be.
The prank war could initially strain their friendship. For example, if Johnny's pranks are too extreme, Valentine might get really angry. But on the other hand, it can also strengthen their bond as they start to understand each other's sense of humor better over time.