Fancy! is a noble and very expensive restaurant in Bikini Bottom. The Fancy! restaurant has been viewed in a few episodes so far.
In Krusty Love, Mr. Krabs and Mrs. Puff go on a date to the restaurant and when the bill comes Mr. Krabs nearly has a heart attack and the restaurant blew up when the bill was changed.
Obviously it was rebuilt because in Chocolate With Nuts, SpongeBob, Patrick, Mary and her mother went to the restaurant and booked out the whole restaurant just to dine there. In that same episode, Squidward attempted to get in although he was not allowed to. SpongeBob has once rented the house using Tom's money and did it with Patrick Star.
SpongeBob also worked here in exchange, and brought Krabby Patties in the episode: Le Big Switch . It is revealed that the main chef of Fancy! is Mr. Le Schnook, who is a greedy purple selfish villain. He is extremely wicked, and SpongeBob has become the Exchange Chef of Fancy! He brought Krabby Patties, but then brought back the popularity of the Krusty Krab, and also Fancy! became bankrupt or sold out.