Felix Felices Harry Potter Necklace.
"Well, here goes," said Harry, and he raised the little bottle and took a carefully measured gulp.
"What does it feel like?" whispered Hermione.
Harry did not answer for a moment. Then, slowly but surely, an exhilarating sense of infinite opportunity stole through him; he felt as though he could have done anything, anything at all...and getting the memory from Slughorn seemed suddenly not only possible, but positively easy...."
— J.K. Rowling, Harry Potter and the Deathly Hallows
Own your own little bit of liquid luck!