Right then so
When I was little I had this dream where me and my parents moved away from our house, and I was like eight I think. Anyways, my Dad was friends with the people who moved into our old house so we came back to it to talk to them. My parents went into the kitchen to talk with my Dad's friends, and my Dad's friends had two boys about my age so I decided to talk to them. I forget what we talked about.
Anyways, about five minutes later in my dream I saw my parents were standing at the glass door that looks out on this screened-in deck we have, and they called me over to see something.
At that point, I distinctly remember my mother pointing and saying 'Look at that spider in the corner of the deck there!'
So I looked, and there was a spider larger than the size of my hand, sitting in a web in the far corner of the deck.
At this point, my parents and my dad's friends totally vanish from my dream, but those two boys are still there.
Anyways, the spider begins growing. And growing. And growing. Soon it's the size of the deck.
I do the thing any eight year old would do and dive behind the couch, before the spider smashes the glass door and enters the house. I'm pretty sure it shouldn't be able to fit inside the house at this point according to the laws of physics, but I guess dream-logic?
Those two boys are with my behind the couch, and at some point in my dream I found a stick. And the spider starts looming over us because, well, couches don't really stop massive spiders. And one of the boys yell 'It's gonna bite us!' So I jab it with the stick and it backs up and flinches away. Then it starts turning around.
The boys and I try to sneak from the couch to the front door to get out, but this thing attached to the spider's abdomen that looks like a purple pipe cleaner suddenly wraps around one of the boys, constricting and drawing him close. He suddenly cries out 'Oh no! It's gonna sting me, that's even worse!'

Then I woke up.
That is... the SECOND most vivid dream I have had, and the one that makes the most amount of sense.