By now, you're probably very well-aware that Starbucks has a limited-edition drink called the Unicorn Frappuccino.
As far as reviews go, the response is generally positive, with some people even comparing it to "magic"...
...which is actually pretty ironic, because Harry Potter fans have been quick to point out that by drinking the Unicorn Frappucino, you may actually be doing yourself some ~harm~.
The joke is in reference to the unicorn blood in the Harry Potter universe. As the quote from Harry Potter and the Sorcerer's Stone goes:
"The blood of a unicorn will keep you alive, even if you are an inch from death, but at a terrible price. You have slain something pure and defenceless to save yourself, and you will have but a half-life, a cursed life, from the moment the blood touches your lips."