Kids’ unboxing videos are YouTube series where children, or occasionally just disembodied hands, take toys out of their packaging and play with them as uplifting music plays in the backdrop. One particularly popular video shows a tiny boy unwrapping and assembling a child-size electric car, using plastic tools that could surely break apart in less practiced hands. Then drives the automobile down the sidewalk via an eerily empty neighborhood to a playground that’s also completely empty, where he plays by himself, presumably because the rest of the neighborhood children are busy watching YouTube. The video has 267 million views.

Toy makers, who are professionals at taking advantage of children’s weird interests, have finally figured out making a toy that replicates what kids like about unboxing videos. Enter the L.O.L. Surprise! doll, a sphere how big is a bocce ball that involves seven layers of packaging. Kids peel away the layers of crinkly plastic, that have stickers and messages and tiny accessories that are surely crunched under many a parental foot, and discover a small, practically naked plastic doll with giant Bette Davis eyes who measures simply a few inches tall.

A lot more than 800 million L.O.L. Surprise! toys have already been sold since their debut in late 2016, plus they were among the top products sold on Cyber Monday this season, according to Adobe Digital Insights. This season, a lot more toy makers have caught to the trend. Parents is now able to buy eggs, pods of foam, cake pops, burritos, and balls of several sizes and shapes containing mystery animals and figurines. (“Unrolling may be the new unboxing,” said Ashley Mady, the top of brand development at the business that launched the burritos, called Cutetitos, in October.) Some balls contain “boy-themed” surprises, such as insects, octopuses, skateboards, ninjas, and a packet of a powdery substance, and the best, Poopeez, which are rolls of wc paper that hold mystery capsules with names including Lil’ Squirt, Skid Mark, and Toot Fairy. (“These new blind capsules are creating a stink around Kerplopolis faster when compared to a fart disappears in the wind,” according to marketing material on Amazon.)

L.O.L. Surprise! dolls were created by MGA Entertainment, the business behind the oversexualized plastic Bratz Dolls which were a hit in the first 2000s. Isaac Larian, the CEO, explained within an email that L.O.L. dolls were essentially reverse engineered: The business wanted to profit from the unboxing and collectibles trends, therefore it developed L.O.L. dolls. MGA Entertainment was told, initially, that kids had a need to visit a product before they might require it, Larian said. But L.O.L. dolls proved analysts wrong-kids can apparently want things without even knowing what they are. MGA Entertainment has since branched out into L.O.L. Surprise! pets, L.O.L. Surprise! houses, and larger L.O.L. Surprise! capsules, that have a large number of dolls and accessories and retail for approximately 80 bucks.

Initially, unboxing videos are a particularly bizarre phenomenon to model a toy on. Kids are essentially watching other, luckier kids get plenty of expensive toys, playing and never have to work with school, or nap time, or that perennial enemy, broccoli. Some unboxing stars have grown to be millionaires-one 6-year-old named Ryan made $11 million this past year, and all he does indeed is open toys, seek out toys in his pool, look for toys at Walmart, meet life-size and slightly creepy versions of his favorite toys, and go along well along with his parents. His YouTube channel has 17 million subscribers, and a video of him collecting giant eggs from his personal bouncy castle and opening them to reveal toys inside includes a mind-boggling 1.6 billion views.

There are biological reasons small children like watching unboxing videos, and it’s the same reason they’re attracted to surprise toys. Kids don’t really get proficient at understanding and anticipating the near future until they’re about four or five 5, Rachel Barr, the director of the first Learning Project at Georgetown University, explained. At that age, they begin looking forward to things that may happen later on, and they also like watching videos that contain an anticipation aspect to them. But kids of this age don’t particularly like being frightened, so they like videos where they understand that nothing bad will probably happen. Unboxing videos and surprise toys allow kids to take pleasure from the anticipation without having to be too afraid, Barr said, because they know roughly exactly what will maintain the package, not the precise details.

Kids will watch unboxing videos over and over-or open surprise toys over and over-because they grab new details each time, Barr said, determining how unwrapping works. One of the most popular unboxing videos on YouTube are of surprise toys, including a 12-minute video with 321 million views when a boy tears open a huge golden egg to discover a load of Spider-Man-themed candy and toys, including a few smaller eggs that he also unwraps. The video, which is packed with commercials, ends with him screaming in excitement as his final egg carries a little Spider-Man.

Unboxing videos have their benefits: They allow kids to hook up with other folks, experience toys that their parents may not be in a position to afford, and go out, in ways, with other kids, regardless if they reside in a location without a large amount of children or where it’s too dangerous to go outside, according to David Craig, a professor at the USC Annenberg School for Communication and Journalism. Parents may not mind videos where children watch other kids play with toys, he says, if it keeps them out of trouble.