Tomb Raider Anniversary Easter Egg - Indiana Jones in Tomb of Qualopec

Play through the 4th level, Tomb of Qualopec, until you'll have to pull a golden lever in order to raise the first of three portals that lead to the throne room.

Then get back to the central platform, and a rolling stone will be released. Now, look closely: You'll see a hat and a whip attached to it. That's a reference to Indiana Jones!

(Maybe you'll have to be killed in order to see it.)