Dinosaur poop, Beethoven's hair, 10 strangest collections in the world

People like to keep keepsakes that remind them of good times or help them relive a place they've been. But while it's human nature to attach to objects, some have built huge and strange collections. If you're curious about weird personal favorites, here's a top ten list that will blow your mind.

10. Do Not Disturb Sign Collection

Do-not-disturb signs are common in hotels and motels, and guests can use them to tell visitors or cleaners that they don't need to be disturbed. But did you know that a guy from Germany is famous for his impressive 11,570 "Do Not Disturb" signs?

These signs guide people to maintain privacy and respect wherever you go. Rainer Weichert may be the only person on earth who recognizes the value of these signs. His obsession with "do not disturb" signs made him the world record holder in 2014. Rainer has traveled to 188 countries since 1990. On each trip, he collected signs of various shapes and designs.

09. Miniature chair

How old is your favorite chair at home? Barbara Hartsfield from the US has the world's largest collection of miniature chairs that no one sits on! In 2008, Barbara collected about 3,000 chairs over the past 10 years, an impressive achievement that made her a Guinness World Record holder.

In 2009, Barbara opened the Collections & Antique Chairs Gallery, a museum that houses her impressive collection. People traveled from all over the United States to see her small, functional chairs designed as lamps, clocks, salt shakers and cookie jars. Who knew a quirky hobby like this could turn into a business?

08. Vomit bag

For most of us, traveling by air is the best opportunity to view scenic photos or connect with strangers. But for Niek Vermeulen from the Netherlands, travel can also be an opportunity to collect vomit bags!

Niek Vermeulen's passion for collecting bar bags stemmed from a bet he made with a friend to see who would collect the most. Since Niek set out to build the largest collection of airsickness bags in 1986, his collection has grown exponentially, and 26 years later he has set a world record. In 2012, Nick (Niek Vermeulen) won a bet when he collected 6,290 vomit bags from 1,191 airlines in at least 200 countries to put them in the Guinness Book of World Records.

Niek's favorite bag from the collection is the one that spent 16 days in space on the NASA space shuttle. For Niek, his sickness bags are more than throwaway disposables because they carry memories of good and bad travel experiences.

07. Hamburg related projects

Burgers are classic, not because they'll satisfy all your needs in one bite, but because they're the most versatile meal on the planet. While it's hard to pinpoint who liked the meal the most, Harry Speer (aka Burger Harry) is probably the number one burger fan.

Harry bought plastic hamburgers that he thought would make the trays look more appealing, Harry thought they looked incredible, and he would be enjoying them for the next 26 years. In 2014, the Guinness Book of Records recognized Harry Sperl's burger-related collection with 3,724 items.

Among his collections, Harry has multiple collectibles, including a custom hamburger Harley-Davidson and a hamburger waterbed. In the future, Harry hopes to expand his collection by opening a museum shaped like a double bacon cheeseburger.

06. Back scratcher

Manfred S. Rothstein has a collection of 675 back scratchers from 71 countries.

Professional dermatologist Manfred Rothstein became intrigued after receiving a demo plastic back scratcher at Atarax. Since then, Rothstein has started collecting back scratchers of all similar items on his travels. Later, Manfred even started receiving back scratchers from patients, friends and donors.

His collection of back scratchers includes crocodile claws, hand-carved ribs and kangaroo claws. These back scratchers all have one thing in common. They soothe hard-to-reach places.

05. Clocks

Do you find yourself staring at the clock at the end of a long day? Jack Schoff from the United States is a time-obsessed person. On his walls, he has the largest collection of timepieces in the world. Jack started collecting clocks in 2003 and set a Guinness World Record in 2010 with 1,509 functional clocks registered.

04. Pizza Box

In 2013, Scott set a world record by collecting 595 pizza boxes.

Scott Wiener saw the most artistic pizza box he had ever seen during a trip to Israel in 2008. That's when he realized that pizza boxes could be fun.

Since then, Scott has collected unique pizza boxes from around the world. With the help of family, friends and fans, he has built his collection time and time again. Recognizing his celebrity status, Scott even published a book, "Hooray Pizza! The Art of the Pizza Box" to share his amazing collection with the world. With over 1,500 boxes and counting, Scott shares his love of pizza by lending them to museums and exhibits.

03. Celebrity Hair

Many parents keep a little bit of hair as a souvenir after their baby's first haircut. But for John Reznikoff, collecting celebrity hair was even more exciting and rewarding.

John Reznikoff is one of the weirdest hobbyists on the planet because he is a collector of hair falling from the most famous heads on the planet. John is now a world record holder with fluffy memorabilia of Elvis Presley, Beethoven, Abraham Lincoln, John F. Kennedy, and even Marilyn Monroe.

Today, the hair collection is $1 million insured, a source of pride and joy for John Renzikoff as they tell important stories from the past.

02. Traffic cones

In the UK, one man, David Morgan, has vowed to collect all the traffic cones in the world. He already owns 500 traffic cones of various shapes, colors and sizes.

The passion for collecting cones started in 1986. David Morgan, who works at Oxford Plastics Systems, fell in love with the mark logo. From then on, he will add to his collection by collecting safety products everywhere.

Now Morgan is still searching for rare pentagonal cones from Manchester to complete his collection. As far as peculiar collectibles are concerned, Traffic Cone feels like the top few.

01. Dinosaur poop

Museum collectors prefer to display dinosaur bones, and George Frandsen takes the study a step further by collecting fossil dung! George owns at least 5,000 specimens of dinosaur feces and is the world record holder.

For now, such collections are important to scientists because they provide important clues about what animals ate as they roamed the planet. A renowned collector, Flandersson even lent his collection to the South Florida Museum. Today, Frandsen runs his online site, Poozeum, which only shows ancient poo!