Looks like the folks at Ubisoft are Indiana Jones fans, as Far Cry 4 hides what definitely appears to be a quite cool Easter egg related to Lucasfilm's adventure movies.

As you can see in the video below, courtesy of YouTube user Lets Talk About Games, the game includes a cave full of cups, with a skeleton against a wall holding another cup, evidently killed by its contents.

This is a quite clear homage to the scene of Indiana Jones and the Last Crusade in which Indy recognizes the real Graal, while his rival Donovan gets killed by his greed.

This isn't the only hint to the Indiana Jones series in the game, as the table over which the protagonist is supposed to have dinner with Pagan Min at the beginning of the game is also very reminiscent of Indiana Jones and the Temple of Doom.