“Everybody was sold out,” says Ms. Dobin of Westport, Conn. This was a big problem because her son and many children in his class have recently gone crazy for unicorn games, toys, and clothes.

Yikes, there’s a horse in the concourse. Thousands of people on Twitter have joined forces to locate the owner of a plush toy unicorn, which was discovered near a baggage claim in London’s ...

Still, star of the Hasbro booth for me was the unicorn in the corner. When I was a child this level of physical animation was only found in big budget movies, now it's on toy shelves and in toy boxes.