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They range from the risky to the heart-warming - but what they have in common is that they're all very strange. To outsiders, at least.
Here we present some of humanity's most downright baffling traditions. Some, such as the Busojaras festival in Hungary, where locals dress up as woollen monsters, go back centuries, others date back a handful of decades - like the annual mooning-at-Amtrak-trains festival.
People - Fervour - Scroll - Weirdness
They're all fascinating, though - more so because the people that participate in them do so with such fervour. Scroll down and revel in the weirdness.
During the month of February people in the Hungarian town of Mohács don woollen horned monster outfits and take to the streets.
Days - Busójárás - Festival - Man - Alight
Lasting for six days, the vibrant Busójárás festival sees a man made of straw set alight on a bonfire, with some saying this represents scaring away winter.
The Unesco cultural heritage festival is also said to pay homage to a legend that claims villagers dressed as grotesque monsters to scare off the invading Turkish army in the Battle of Mohács in 1526.
Underwater - Music - Festival - Florida
Underwater Music Festival, Florida
Each July, hundreds of music-loving snorkelers and divers hold an underwater concert at the Florida Keys National Marine Sanctuary.
Water - Mock - Guitars - Instruments
They duck under the water to pretend to jam on mock guitars or play other fake musical instruments.
During the four-hour music session, popular songs that are played include the theme from The Little Mermaid, the Beatles' Yellow Submarine and Jimmy Buffett's Fins.
Carnival - Binche - Town - Year - Sunday
The Carnival of Binche is held in the Belgian town each year on the Sunday, Monday and Tuesday leading up to Ash Wednesday.
It sees up to 1,000 men and boys dressed as 'Gilles' taking to the streets in vibrant dress, with wax masks and wooden footwear.
Celebration - Century - Unesco - 'Masterpiece
The celebration dates back to the 14th century and has been listed by Unesco as a 'Masterpiece of the...
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