Apparent Water Theme

I was visiting a pal of mine whom I'll simply call "Scooter." I was at his house, though it wasn't his real house but an imagined facsimile. His sister was there, and seemed mopey and rude, so I avoided her. He and his wife were playing a console game in front of a television. Their kids were only partially present, and were understood to be in another room of the house. I remember there were a couple other details, but unfortunately I've since lost them all but very faint hints of what they once were.

Then Scoot was driving me somewhere, and as we rode along, a white tow truck with a rusty crane comes barreling through an intersection, apparently loses control, and rolls side-ways for a while before going off a cliff or something and into a body of water. I thought to myself, aw, great, and we got out and ran after it, hoping to get the driver out before he drowned. We must have gotten separated though, and I ended up by myself where I thought the tow truck had stopped. There was an older man, with thick glasses and a graying black beard standing in what looked to be a large, concrete water basin, rectangular in shape. There was a large, almost water-wheel looking contraption, with a wooden bucket attached on one end, and perhaps a stone weight at the other. The man was somehow pumping a wheel mechanism by the stone weight, at first seemingly in order to get the water out from where the tow truck was. But then there was no tow truck, and the man looked at me puzzled, seeming to wonder why I was there.

Then for some reason I went into a house, or maybe an apartment, and Scooter was in another room. We were looking for something, I'm not sure what, though it wasn't the truck anymore. I don't remember the details very clearly, but something happened, Scooter either left or just plain disappeared. I went back to the door and found it'd been locked. The lights went dim, and a formless, whitish apparition appeared and started towards me. Something told me it was an electric or lightning demon, and I knew I had to get away from it. Then I was outside, running away. I rounded the corner of a brick building, and saw and grabbed a weird, leather-yet-clay pot, or water vessel or something, and lay in wait for the thing to come, presumably to hurl this thing at it and hence defeat or destroy it. While I waited, from somewhere out of view and around the other side of the corner, smaller versions of the water pot fell into view in an arc, as though thrown, one after another. Where they hit the ground, they turned into weird looking long-legged, brown-orange, clawless crabs that once fully formed, simply wandered away.