Unless you're referring to the viSe scene, where Nicky sticks a man's head in a vise grip and pops his eyeball out information on that scene can be found in the trivia section. It also foreshadows the tragic events that unfold later in the movie, including Ginger's affair with Nicky Santoro (played by Joe Pesci) and the violent consequences that follow.
The scene is significant because it shows the breakdown of Ace and Ginger's relationship and highlights the destructive nature of their addiction to drugs and gambling. The argument escalates, and Ginger becomes violent, throwing objects at Ace and eventually storming out of the room. She then accuses Ace of being involved in illegal activities, including his own gambling operations. Ginger becomes defensive and denies any involvement in the drug trade. Ace tells her that he knows about her drug use and that he has proof, including photographs of her with a known drug dealer. There is a scene in which Sam 'Ace' Rothstein (played by Robert De Niro) and his wife Ginger (played by Sharon Stone) are in their bedroom, and Ace becomes angry with Ginger for her past involvement in the drug trade.
