The jars were odd, I wasn't thinking blood, but urine, like Jacob has no potty time. Did you guys also see the picture Locke looked at when he first entered the shack, it looked like a dog, a whitish dog... Vincent anyone. I couldn't see it on my TV, but when i watched again online it was pretty clear. Screencaps anyone?

i was kidding about the Dhama Urine, but heck, who knows.