Which Eon film that stars Sean Connery as the fictional MI6 agent James Bond, features two James Bond villains that are known for trading quips after killing their targets appear?
Mr. Wint and Mr. Kidd:  One of their trademarks is trading quips after killing their targets; they also do so after a failed attempt to kill Bond. Diamonds Are Forever (film): Diamonds Are Forever (1971) is the seventh spy film in the "James Bond" series by Eon Productions, and the sixth and final Eon film to star Sean Connery as the fictional MI6 agent James Bond.
Diamonds Are Forever