It's every parent's worst nightmare - when someone gives your child a noisy toy of some sort, you know your days of peace and quiet in the house are about to end.
That's exactly what happened to William and Kate, when they were out for a royal engagement in Birmingham.
The couple paid a visit to Acme Whistles, a 147-year-old family-owned business, where they received a few gifts to take back to Prince George and Princess Charlotte.
Kate, who's currently expecting the pair's third child, was handed the bag with the presents for her two children, which included a pair of Samba whistles, a plastic slide whistle and a wooden duck call.
The Duke and Duchess hear about the 147 year history of Acme Whistles before touring the family-run business. pic.twitter.com/sFlM87Ur66— Kensington Palace (@KensingtonRoyal) November 22, 2017
Kate and William visited a whistle factory
But while William accepted the keepsakes gratefully, he spoke like a true parent when he said they can't show it to the four-year-old, or they'll never get peace again.
'Don't show that to George; we'll never get any peace,' the dad joked.
The only hope for the Cambridges now is that George still cares more about his Lego than his new musical toys.
William is worried he'll never get any peace if George gets his new toys
Earlier this year, the doting dad revealed that George loves playing with the plastic bricks - a year after Kate revealed he 'loved playing with dinosaurs'.
'My son's very into Lego and he'd love this. It's incredible', he said during an official visit to McLaren Automotive's headquarters in Woking, last September.
All of the glimpses Kate and William have given us of Prince George's hobbies over the years have been quite traditional, and it's probably no coincidence that modern toys like tablets aren't featuring in the little royal favourite pastimes.
It sounds like Christmas will be a bit little louder in the Cambridge household this year...
The parents have reportedly banned their children from playing with iPads, in order to encourage outdoor play and an active imagination.
But if any of the two siblings is likely to cause mayhem with the whistles, it's probably George who's been branded a 'little rascal' by his dad.
'George is a right little rascal sometimes. He keeps me on my toes. But he's a sweet boy,' William previously said of his firstborn.