Reuben describes the ensuing band's sound as "noise, spazz, angst-pop" and Pearl's lyrics as ironic.
Generally it is Reuben who nuts out the melody, and jams with Daniel to get it right, while Pearl gets some words on paper - sometimes in the space of 10 minutes.
"It's noise over noise over noise, rather than lyrics with big ideas. I'm 15, I don't have big ideas about things," she says.
But if she had to describe them, her lyrics are scathing of indie kids who think they are better than other people because they are so alternative.
Bandicoot played their first gig in May to 40-plus people crammed into a small K Rd cafe.
Not long afterwards they played at the Smokefree Rockquest and though they won the People's Choice award, what really boosted their profile was their success on the bFM playlist. Their track Emotional and Dirty rose to hold the number one spot for three weeks in September last year.
"It felt really weird because it had turned and it was like, ok, do we have to be serious about this now?" Pearl says.
From then, it has been all go. As well as being approached to play at the Big Day Out, Bandicoot have about 10 other gigs to play before school resumes, including the indie festival Camp A Low Hum in Bulls.
They're dead excited about playing the gig tomorrow - they just hope people realise the festival is open when they are on at 10.30am.
Bandicoot promise a performance as wild as the Mint Chicks. Daniel reckons he goes so crazy that he once found blood on his snare and is not sure where it came from. Reuben will definitely get into the crowd, he says. And the audience has Pearl's word that she will be wearing something outrageous - she's not sure what, but she is thinking leopard.
Lowdown
Who: Bandicoot
What: Local noise-pop three-piece from Western Springs College
Where & when: Big Day Out, Essential Stage 10.30 - 11am
Latest: EP Happy Talking released in September, next EP Jurassic Warfare due out this month.