You can see the key difference between an adult audience and one full of kids when you ask for a volunteer.
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That's the conclusion drawn by Matt Kelly, one half of children's entertainers The Listies. While they mainly focus on kids, they've also done the odd comedy show for grown-ups.
"We always say the difference between the two is when you ask for a volunteer when you're doing an adult show, everyone starts staring at the floor, no-one puts their hand up and the person that you pick cries," Kelly says.
"Kids are the exact opposite. When you ask for a volunteer, everyone puts their hand up and the people that you don't pick cry. Other than that, it's exactly the same thing."
Well, except for all the poo, wee and fart jokes.
"Our shows come with a 100 per cent education-free guarantee," Kelly says.
"It's like the opposite of learning, in fact you finish the show dumber than what you started - that's because all of our shows are rated S for Stupid."
The latest show from Kelly and fellow Listie Richard Higgins features the best bits of their previous shows.
The stated aim is to make the audience laugh out loud as many times as possible in 55 minutes. And maybe even ROFLSHALBOWCO - which is internet slang for Roll On The Floor Laughing So Hard A Little Bit Of Wee Comes Out.
But if you thought there was no moral at the end of a Listies show, then you're very much mistaken.
"The moral is that the theatre is a really fun and exciting place to go," Kelly says. "And that every time you go, you get to throw things at the performers' heads, they may throw up on you, or snot flies out of their nose and may land on your face."
Much of the inspiration for their shows comes from hanging around kids. Higgins works as a clown doctor while Kelly is studying to become a primary school teacher. Also, it helps that they're "gigantic kids".
And so, it would seem, are the parents who come along to a Listies show with their kids. Because the pair don't write jokes just for the grownups - they end up laughing at the poo and wee jokes too.
"What we try to do with our shows is make sure the kids and the parents are laughing at the same thing," Kelly says.
"We don't throw in jokes just for the parents. We try and have everyone on the same page because we want our shows to be a shared experience between family members rather than having two separate shows going on at the same time.
"We're pleased to say we've found parents laugh at fart jokes just as much as kids do if you do it in the right way. And we have a secret formula for that."
The Listies Make You LOL! at Illawarra Performing Arts Centre, April 14 and 15.