Lotus Eaters

In Greek Mythology, the Lotus eaters  (also named as Lotophagi, or Lotophaguses) were a race of people from an island near North Africa, filled with Lotus Plants. The Lotus plants are the food of the island that were narcotic and addictive, causing people to sleep in peaceful apathy. Those that ate the Lotus plant lost all will and memory.

They are famous for their part in the Odyssey, where two of Odysseus' men had to be dragged back to the ships by him because of the plants effects.

The Lightning Thief
In the book, they give Percy, Annabeth and Grover magically unlimited credit cards and encouraged them to stay at the Lotus Hotel and Casino. No lotus plants were seen, though Percy said that the hotel smelt like them (despite the fact that he had probably never smelt one before) before entering. The games were designed to mesmerize the guests, and Percy had to shout "Spiders" at Annabeth to snap her out of it (her greatest fear overcame the magic). If guests of the hotel try to leave the casino, the workers offer them Platinum Member credit cards that allow you to access a new floor of games.

The Lightning Thief (film)
In the movie, waitresses handed out lotus cookies to the guests so that they would forget who they were and would end up staying in the Lotus Hotel for all eternity. After a mental push from his father, Percy stopped eating the flowers and snapped Annabeth and Grover out of their trances. When trying to leave the hotel, the lotus eaters attempted to stop Percy, Annabeth, and Grover from leaving, so they stole the sports car on display and crashed through the window.