A man's been showing off his collection of 500 crisp packets, so we want to know what you collect, whatever it is!?!
Here at Newsround Leah didn't collect anything as a kid.
Sonali used to hoard nail varnish and kept them in her mum's fridge.
Ricky used to collect - and still does - different types of cola bottles from around the world.
And Hayley used to collect shells and rocking-horse statues, but now she keeps posters from 80 years ago and a stone from every beach she visits!
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"Mine's strange - but I collect pencil leads. You know when they snap and some lead comes out? Well that's what I collect. I've got a whole little box full of them, in lots of different colours. I also have my granddads coin collection, of coins from all over the world! I've got loads!"
Bethy, 13, Brittany, France
"I am going to start collecting shells when I go to the beach soon!"
Dora, 8, New York, USA
"I have a full collection of Rainbow Magic books. I also collect Malory Towers books and Hello Kitty cards."
Rachel, 11, Staffordshire, England
"I know it sounds a little strange, but I collect rocks. Any rocks, rocks that have a really interesting texture or shape. I started my collection when I went on holiday to Canada last year, and my Dad and I found a shop full of colourful and interesting rocks. I keep them all in a little velvet pouch and currently have about twenty or so."
Amy, 14, Bournemouth, England
"I love to collect Lego. I've built loads of houses and men and my room is full of it."
Ben, 9, Glasgow, Scotland
"At school we have just had a huge sticker craze. Girls would bring in packets, stick them on their diaries and swap them. It went all the way through the school and the teacher got so fed up of girls swapping and rearranging stickers they banned them. Girls carried on after that but then they were really told off. Now girls collect these rubber bands that come in different shapes such as fast food, space, princess, rock and sea life."
Imaan, 10, London, England
"I collect different art paintings and very quirky things for my room."
Louise, 9, Staffordshire, England
"I collect Teenie Beenie Babies and my sister and I have over 150 of them. Some people have Beenie families which are worth a bit in the future. I only collect tigers and cheetahs."
Louise, 13, England
"I collect pens and pencils. I have lots!"
Emily, 10, London, England
"I collect chocolate bar wrappers. I have loads already, and I only started a few months ago!"
Fiona, 12, London, England
"I collect Horse magazines, I am horse CRAZY and reading these are a lot of fun!!
Ella, 13, Dorset, England
"I collect key-rings. I've got 25 and I am still collecting."
Emily, 12, Kent, England
"I collect DVDs and I have 185 so far."
Joe, 13, Nottingham, England
"I collect one pennies. I have two piggy banks full of them and I am still collecting but I have never got around to counting them."
Ella, 10, London, England
"I collect juice bottle tops."
Anna, 11, Norfolk, England
"My cousin collects rubbers. She has a massive box full of them under her bed. She has so many in all different shapes, colours and sizes! I buy her one wherever I go on holiday. I bet she has at least 200!"
Eve, 12, Cheshire, England
"I collect key-rings. I have over 100!"
Amie, 11, London, England
"I collect Marvel comics and graphic novels."
Joe, 10, Suffolk, England
"I still collect soft toy dogs but now I also collect Build-A-Bear soft toys."
Carys, 13, Carmarthenshire, Wales
"When I was younger, I used to collect statues and ornaments. It only stopped last year when I moved house and had to get rid of them!"
Stella, 12, London, England
"I collect teddy bears and I have over 70. My newest one is called Cody!"
Charlette, 11, West Midlands, England
"I collect Doctor Who stickers. I have three hundred already!"
Grace, 12, Derbyshire, England
"I collect JLS stickers."
Tiff, 13, UK
"I collect train tickets. I love going on trains and remembering where I went on them."
Pearl, 11, Cardiff, Wales
"I collect stamps. Nothing interesting to my friends or family, but I think it is!"
Saffron, 10, Aberdeen, Scotland
"I collect JLS stickers, which are amazing. I've got loads!"
Sophie, 12, Manchester, England
"I collect fizzy drink bottles and cans too, like Ricky. I've got some from the 90's and some from my holidays to America."
Ian, 12, Cornwall, England
"I collect stones and pebbles from the beach. I must have a few hundred by now!"
Amelie, 11, London, England