As Harry Potter fans know, Felix Felicis is a very special potion, one that confers luck onto the drinker and success in everything they try for a time.
It's also, however, the name of a very special cafe in Buenos Aires, Argentina, that's just a little bit Harry Potter crazy.
The eatery has been quietly building up Harry Potter design touches over the last few months and is gaining quite a fan base.
Its owners, Natalia Montoya, Marcelo Ferrán, Pat Hryb, and Juan Pablo Valencia began their makeover by using the films' logo on the toilet signs and adding a sticker on the lid directing users to the Ministry of Magic, Buzzfeed Español reports.
Then, over time, they began adding more and more touches to the delight of their visitors. However, co-owner Ferrán insisted to Mashable that they're "not a Harry Potty themed cafe."
"We are just coffee geeks who love Harry Potter," he said.
The place has served coffee and serious sandwiches since March last year
But it's pretty clear where their true love lies.
There are references to the Harry Potter universe throughout.
Owls are everywhere.
Sorting hats appear in the froth of your cup.
There's even a Room of Requirement.
Of course the mugs look like this.
There's a cute statue of Harry himself.
And there's a secret passageway to the Ministry of Magic.
“The name came from my son, Félix, and from my love for Harry Potter," co-owner Marcelo Ferrán said.
"The name, Felix Felicis, happens to apply perfect to our coffee. Just like the potion, it's marvellous if you get it right, and catastrophic if its made wrong," he told Mashable.
All they need to do now is introduce a range of butterbeers and Felix Felicis will be true Harry Potter heaven.