On the Falling Down course, in the Terminal Velocity set of levels, if you manage to ride off of the starting platform, and get behind the barrels, you can slowly work your way backwards to an odd framed picture of some sort of lizard or dinosaur. The might just be some sort of asset you can use in the editor, but I haven't seen it anywhere else in the game. I shot a video of the picture using my phone (I realize I could have just taken a picture and I did, but I have no clue how to upload it somewhere from my phone). I figure I'll shoot a video of how to get to the painting tomorrow with the help of someone else so I can play while the video is shot. I should also mention if you're going to attempt to get to the painting, you should really lower the volume on your TV, as an incredibly loud and annoying sound plays the closer you get to the picture.

Obviously a cave painting indicating the origins of the reptilian conspiracy.

I have my eye on you. 0_______o

@HerbieBug: I have no idea what you're talking about, everyone who wants to live past tomorrow knows there's no reptilian conspiracy.

The wind sounds like reversed audio, when you reverse it it just sounds like a someone saying shush, shh, and shut up. Of course, I could just be crazy.

Seems similar to the riddles that people found in Trials HD that were solved just a few weeks ago.

It's the big cryptic secret from Fez.

Looks like a piece to another riddle. Here's the one from Trials HD. It's pretty crazy.  I would have no hope of ever solving something like this myself.
 
  

@Dethfish: Holy shit, what the fuck? What have I gotten myself into?

@Dethfish: So basically the riddle was trying to pull a LOST on us? Get us to be all introspective and philosophical through cryptic references to history till a lot of vocal people get pissed off because there weren't any answers. Really at this point I should just expect that once they start dropping Da Vinci references, the H2G2 and Fibonacci stuff are just logical next steps in the path to any intriguingly cypher.

Putting a lot of disparate and obscure references to historical scientific achievements for the purpose of piquing people's interest without any particular ultimate connection is more an exercise in manipulation on the part of the developer. Clues! = interest! = pursuit of knowledge! = questions! That's a weaksauce 'riddle'.

@HerbieBug: It's also a silly time trial platforming/racing game with dirt bikes, so the fact that it even has something like that in it is kind of cool to me. I also suck at riddles, so any type of riddle seems like a huge mind bender to me.