Halloween Fast FactsBy CNN LibraryUpdated 9:56 AM ET, Wed November 5, 2014Hollywood Halloween 2014 7 photosHollywood Halloween 2014 – Check out what Hollywood's stars are donning this Halloween. Taylor Swift wrote on her Instagram, "Cause, darling I'm a nightmare dressed like a PEGACORN." Hide Caption 1 of 7Hollywood Halloween 2014 7 photosHollywood Halloween 2014 – Beyonce and Blue Ivy went as Janet and Michael Jackson. Hide Caption 2 of 7Hollywood Halloween 2014 7 photosHollywood Halloween 2014 – Katy Perry as a giant Cheeto. Hide Caption 3 of 7Hollywood Halloween 2014 7 photosHollywood Halloween 2014 – Liv Tyler dressed as a stove. She wrote on her Instagram that she has a "Bun in my oven..."Hide Caption 4 of 7Hollywood Halloween 2014 7 photosHollywood Halloween 2014 – Neil Patrick Harris posted this photo with his family and wrote, "Happy Halloween from Gotham City!!"Hide Caption 5 of 7Hollywood Halloween 2014 7 photosHollywood Halloween 2014 – Cara Delevingne wrote "Happy Halloween!! #papertowns"Hide Caption 6 of 7Hollywood Halloween 2014 7 photosHollywood Halloween 2014 – "I was Kurt Russell in 'Big Trouble In Little China.' He was Kurt Russell," Zach Braff said on his Instagram. Hide Caption 7 of 7Here is some spooky background information about Halloween, celebrated annually in the United States on October 31. In 2015, Halloween is on a Saturday. Facts:The word Halloween is an abbreviated version of the phrases All Hallows' Eve or All Hallows' Evening.Halloween comes from an ancient pagan festival celebrated by Celtic people over 2,000 years ago called Samhain (prono: SOW ehn).The festival took place in the United Kingdom, Ireland, and northwestern France.Samhain means "summer's end" and marks the beginning of winter. Samhain is also thought to celebrate the beginning of the Celtic year. The Celts believed that Samhain was a time when the dead could walk among the living.Trick-or-treating began in areas of the United Kingdom and Ireland. People went house-to-house "souling" - asking for small breads called "soul cakes" in exchange for prayer.Adults also went door-to-door asking for food and drinks in exchange for a song or dance.Jack-o'-lanterns are the symbol of Halloween. People in Ireland and Scotland originally used beets or turnips as lanterns on Halloween.An Irish legend says that jack-o'-lanterns are named for a man called Jack who could not go to heaven or hell and was forced to walk the earth forever with only a coal from hell to light his lantern.The name jack-o'-lantern can also be derived from the night watchman who would light the street lanterns every evening.Immigrants from Ireland and Scotland brought Halloween to the United States in the 1800s. Haitian and African immigrants brought voodoo beliefs about black cats, fire, and witchcraft.Halloween Statistics for 2014:(ALL from the National Retail Federation)Spending in the United States this year is estimated to reach $7.4 billion, up from 2013's $6.9 billion.Consumers are projected to spend $77.52 per person, with an average of $29.26 on costumes and $23.40 on candy.46.2% will decorate their home or yard, and 45.8% will wear a costume.14.3 percent of people will dress up their pets.Top Children's Costumes for 20141. Princess - 7.4% - 3,408,5182. Animal (Dog, Cat, Lion, Monkey) - 6.4% - 2,973,3883. Spiderman - 5.6% - 2,610,7804. "Frozen" character - 5.6% - 2,574,5195. Action/Superhero - 4.6% - 2,139,389Top Adult Costumes for 20141. Witch - 8.9% 4,825,7152. Animal (Cat, Dog, Rabbit, etc) - 4.8% 2,613,9293. Batman - 3.6% - 1,977,2034. Pirate - 3.4% - 1,843,1555. Zombie - 3.3% - 1,776,131Top Pet Costumes for 2014 (no data for # of pets)1. Pumpkin - 10.8% 2. Hot Dog - 6.7%3. Devil - 5.3%4. Bumblebee - 4.0%5. Cat 3.4%HalloweenWhat's your Halloween IQ?No tricks here, just some fun facts about the sweetest, spookiest holiday: Halloween. Can you scare up the answers?'Pumpkinsteins' are not your average pumpkinThere are heads growing on Tony Dighera's farm, and they're not made of lettuce.R.L. Stine live tweets a creepy, crawly tale'Tis the season for spooky stories and Twitter's no exception. 5 strange facts about candy cornYes, there's actually corn in it. Corn syrup, if that counts.Boo! ...zy caramel applesCaramel apples are a perk of fall, and while most of us have fond childhood memories of the treat, here's a spin on an adult version.10 of the world's most scenic cemeteriesHere are 10 favorite final resting places around the world. They should be on every traveler's list of things to see before they... you know.Halloween costumes to avoid this yearFreeze! Step away from the stack of face masks and hazmat suits. 5 ways to avoid an unhealthy HalloweenHere are five easy things to keep in mind for you and your family to stay happy and healthy this Halloween.Halloween by the numbersHalloween facts you didn't know you needed to know, like the percent of people who said they eat the white part of a piece of candy corn first.Smartphone wounds and other high-tech tricksHalf the fun of Halloween is coming up with new, creative outfits that will blow your friends' minds.Halloween Fast FactsHere is a look at what you need to know about Halloween, celebrated annually in the United States on October 31. Halloween howlers: Dressing up dogsHere are a few pets from CNN iReport who pulled off a Halloween costume with style and humor.Massive prize-winning pumpkinsIt's the time of the year when pumpkins are all the rage. The bigger and heavier, all the more to brag about. 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