This one was... pretty frightening, actually.
Woke up in the middle of an oddly designed room. The floor was raised in places, with a bunch of platforms everywhere - basically, it was a platforming obstacle course. Well, I made my way through, and at the end there was a pipe exit, but there was a little boy sitting in my way. He said something to this extent: "Have you seen my dad? He was with me on the course, but fell and said he'd catch up, that was a while ago." I said no, but he perked up and joined me to go through the pipe. It was dark, but we had flashlight things. Eventually we slid down an incline into a pool of water, and we were stuck like Sims in a ladderless pool. However, the kid's dad came along and lifted us out. We started chatting, and made our way through the caves.
The caves were a direct imagining of those in Minecraft - dark, meandering places with a few big caverns having several branch areas. When we came to one big branch, his dad said we should stop to get our bearings. Suddenly, the dad was exploring one branch when the kid set off a bunch of TNT, blowing a whole in the floor and knocking himself and me down. We slid down in a bunch of water, landing in an iced over parking complex. I landed on top of a half frozen car, and started wondering where his dad was. He started acting really odd, as if we had never met his dad in the caves and didn't know what I was talking about at all. I wanted to look for his dad, and I saw something in the car beneath me (the snow drifts were deep). While I was digging to get the door open, he apparently found a girl and solved some puzzle to get the elevator running; all the while I was yelling "Where is your dad?" At this point, I was getting really creeped out, and he was acting like one possessed. I finally got light into the car, and saw his dad, frozen solid and half decayed.
I started yelling at him, "WHO IS YOUR DAD?!?" when he suddenly took the elevator up. The girl hadn't seen me, but he was staring straight at me and smiling as the elevator lifted off. As I ran to jump in, I grabbed a weirdly shaped bar off the wall and used it as a grapple to grab the elevator - which was more like a rising platform, since it didn't even take up the whole shaft; I could hang off the side with room to spare.
We all ascended into a canyon of steel, extending infinitely in two directions. The platform we were on (that I was still hanging from) followed a single, floating rail through the canyon, underneath a featureless orange sky (not sunset orange, but more like "Crazy interior designer" orange). The ground above the canyon was flat, infinitely expanding - there was nothing above us, nothing below us, just one long hallway of featureless steel.
By this point, we realized our bodies had changed. The boy went into a rage, demanding to know why our arms had shrunk and our legs grown, to the point that our arms were of no use while our legs had to be our main appendages. He tried to kick my hands off (I was still normal), but the girl stopped him. The platform stopped, and I noticed a slot in the wall shaped like the bar I was holding - it was a key! I swung myself onto the platform and got the bar into the whole. All the while, the boy is in hysterics, crazily ranting about how it wasn't fair, how I wasn't supposed to be there and how it was his right to do something (I'm reading Atlas Shrugged, I think it was a projection from some conversations there). The platform started moving again, but that's where the dream ended.
Overall, it was bizarre - and unbelievably horrifying. In the garage part of the dream, where I found the kid's dead dad and realized the guy in the cave was a hallucination (or worse), it was like the scene in a movie when you realize the protagonist is the real killer, and is about to betray everyone by locking them in a dark room full of monsters.
You can refuse to think, but you can't refuse the consequences of not thinking.