A so-called moonrock that appears in the foreground of a photo taken by NASA when the US made their first landing on the moon.
The shot shows an astronaut walking away from camera towards the moon Rover and one particular rock in the foreground on the side has a very distinct letter "C" stamped or carved into it with a chisel.
Conspiracy theorists think that the C rock could be a stage prop which must have accidentally gotten by the camera department that was filming this huge hoax.
NASA denies this and blames it on a "hair" on the camera lens.
Production assistant A: Hey man, this is the C rock, belongs over there! Here's where we put Moonrock B and that cluster of pebbles.