If you watch Glee, then you know about this ditzy character named Britney S. Pierce who’s the perfect epitome of the dumb blonde. She believes that leprechauns exist and is generally clueless when it comes to, well, everything. And one thing that she fancies (that also doesn’t happen to exist) is unicorns.
If you know anyone who’s anything like her at all, then you’ll probably have a ton of fun with this Inflatable Unicorn Horn. Convince her and all others like her that you’re a magical creature and that you’re special just because you’ve got a white horn on your forehead–all in good fun, of course.
Aside from that, you could also use it for costume parties and events where you have to dress according to a certain theme.