Payback

The head of the outfit gives his son a car for his birthday.  He presents him with the key and an engraved keychain.  Porter, played by Mel Gibson, taunts the mob boss with the knowledge that he kidnapped his son.  He offers to read him the inscription on the keychain and calls it sappy. 

A History of Violence

In the opening of the movie, two mobsters are on the run trying to lie low in small towns.  They are leaving their motel and their blue rabbit's foot keychain can be clearly seen. 

Mortdecai

Mortdecai, played by Johnny Depp, is trying to escape from someone trying to kill him.  He takes a car from his mechanic's while his man servant, played by Paul Bettany, holds off the assassin.  The keychain is the type in which a metal medallion is attached to a piece of leather. 

The Machinist

Trevor Reznik played by Christian Bale confronts the man who he thinks is behind a plot against him. His leather fob keychain can be seen.

Thief

In preparation for the upcoming heist Jim Belushi's character, Barry, is listening in on the owners of the safe for a password to turn off the alarm.  The owners of the safe open their front door and their keychain can be seen.  This type of keychain is hourglass shaped with a metal circle on one end.  There is a notch in the circle where the key is threaded onto the metal bar.

Mission Impossible Rogue Nation

In the beginning of Mission Impossible: Rogue Nation, Ethan Hunt is captured.  The literal key to his escape is on a rabbit foot keychain.  This is most likely a reference to Mission Impossible 3 whose plot centered around the mysterious "rabbit's foot". 

Sex and the City

Charlotte and her ex-mother in law, Bunny, are fighting over her apartment during Charlotte's divorce.  Bunny shows off her keys as proof of her ownership of the apartment.  Bunny has a solid metal bunny keychain.  Quite appropriate. 
From season 5 episode 5