According to its advertisements, Red Bull gives you wings. But one school has decided to keep its pupils earthbound by banning consumption of the caffeinated drink.
Staff at Chatsmore Catholic High in Worthing, West Sussex, complained that children became rowdy after fuelling themselves with Red Bull and Kick, a high-energy drink.
Anne Ward, the acting head, said: "We were becoming increasingly concerned about the level of inappropriate behaviour, so decided to take action before it became a bigger issue.
"If they want to drink these drinks outside of school, that is an issue for parents, but we would rather they didn't while at school."
A can of Red Bull contains 80mg of caffeine - about the same amount as a cup of coffee. It is said to boost concentration and reaction speeds and to stimulate metabolism - although clearly not to Chatsmore High's liking.
In a statement, Red Bull said that people had different sensitivity to caffeine. "The daily consumption of Red Bull should conform to a person's intake of caffeine, and the same is true for children," it said.