In Halo CE, in the second stage when you have to activate the light bridge to get over the chasm. My buddy stood at the edge, looking down: "What are we supposed to do now?" I told my buddy it was an homage to Indiana Jones and the Last Crusade and you just had to have faith that the bridge was there. He was floored at the reference... until he plummeted to his death. He's never let me live it down and we still laugh about it today.