January 19, 2015 1:48 PM EST

Jessie J and her powerful pipes don’t always subscribe to the philosophy of less is more, but you can’t deny that the “Bang Bang” diva has quite a voice. And while most pop singers don’t like to be put in a box when it comes to their music, Jessie J has literally been doing that to herself since she was a kid.

To show off the strength of her vocal cords at childhood auditions, the “Price Tag” singer would pretend she was trapped in a box, talk with her mouth closed and still sound totally intelligible. See the clip, above, from The Graham Norton Show, if you dare.

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Write to Nolan Feeney at nolan.feeney@time.com.

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