Wink, wink

[Charlie Chaplin] and Buster Keaton had an interesting relationship. Long considered rivals but always having avoided commenting about each other in the press, Chaplin hired Keaton for a part in Limelight (1952). Keaton, who was flat broke at the time, went into a career decline after having been signed by MGM in 1928. -- Chaplin, at this point, felt sorry for Keaton due to his hard luck, but Keaton recognized that, despite Charlie's better fortune and far greater wealth, Chaplin was (strangely) the more depressed of the two.

In one scene in "Limelight", Chaplin's character was dying. While the camera was fading away, Keaton was muttering to Chaplin without moving his lips, "That's it, good, wait, don't move, wait, good, we're through." In his autobiography Keaton called Chaplin "the greatest silent comedian of all time".