Dan discovered this strange image in The Misadventures of Tron Bonne the other day; a monstrous face hidden within the Servbot farm truck (Sart Farm mission).
One can spot the face through some clever camera work, adjusting the angle ever so slightly to get a gander at the innards of the vehicle. You can move the camera via the "beacon bomb" maneuver. (hold R2, aim with analog stick)
Kinda creepy looking, no?