Ortisé Williams is planning to play the joker on JLS's upcoming 4th Dimension tour.
His bandmates Aston Merrygold, Marvin Humes and JB Gill will have to prepare themselves for Williams' pranks.
The 24-year-old has admitted she spent £500 in a joke shop so he can cause some mischief.
Ortisé told The Sun: "I filled my whole rucksack with whoopee cushions, pea shooters, the lot.
"If I catch one of them sleeping they are going to get it."
Williams has a history of pulling pranks on his fellow JLS band mates.
He said: "Last time I set off two alarm clocks next to JB while he was nodding off."
Meanwhile, the lads have insisted that they plan to keep making music until they are old and wrinkly.
Humes told the Daily Star: "We'd be happy writing in our rocking chairs.
"We would still like to be singing when we're OAPs - for sure."
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