Between Kogasa thinking that an umbrella carrying babysitter should scare happy children and Seiga thinking Santa needs to take things from people's houses, I'm very amused by how things in the Outside World get into Gensokyo and end up being completely misconstrued by its inhabitants.
So Gensokyo is halloween town?
It was a long time ago, longer now than it seems, in a place Maribel can see in her dreams;
For the story that you are about to be told / took place in the eastern wonderlands of old.
It regards the land where most youkai come from; and if you met one, it'd be best for you to run...
Hermaphrodites and girls of limited age,
Wouldn't you like to see something strange?
Fly with us and you will see / this: the youkai's sanctuary...
First was E-o-S-D, next comes P-C-B,
Poltergeists play to the dead at night...
Er, anyhoo:
"Earth spiders specialize in construction, and some secretly go above ground. They take requests, chiefly from the oni, kappa, and tengu, then emerge above ground and construct a building in one night."
That kinda makes me wonder how they send the requests in the first place. Tie a note to a rock and throw it down the tunnel? Is sending a human down a semi-common occurance?