It happened in Whitehouse Station.
Eyewitness News reporter Carolina Lied has the story.
Some kids brought 200 pennies to pay for their lunches Thursday. They walked away with detention slips instead of lunches.
Student Amanda Wolfenden never thought a bunch of coins would put her and 24 of her classmates in hot water.
The Readington Middle School eighth graders put together the penny prank in mere minutes, and now they're looking at two days of detention.
"When the lunch ladies caught wind that we were all trying to pay in pennies, they were very aggravated and thought they were disrespected," Wolfenden said.
The students arranged the prank through text messages, online blogs and the good old fashioned telephone line.
But what they thought was a joke was anything but to the lunch staff who had to count the coins.
"I don't think it was their intention to do much harm, but there's consequences for the behavior when other kids are inconvenienced that way and couldn't get through the lunch line," Superintendent Dr. Jorden Schiff said. "Or the lunch ladies having to count thousands of pennies."
"There's no rule in the rule book that states that pennies can't be used to buy lunches," eighth-grader Sarah Henschel said. "We never thought they would do this. We thought they would give us a silent lunch or just yell at us."
But some parents are sticking by their kids, saying the punishment is too harsh.
"Two detentions is way too much," dad Tom Henschel said. "They don't get anything out of it."
The kids say a half an hour is not enough time for 250 students to get through the line and eat lunch. They say they just wanted to send a message, one penny at a time.
The superintendent says the district responded, one detention at a time.