a few ideas:
Photography:kirelian photography..pictures of supposed hauntings..there are tons out there..including some good debunking sites,too
Language Arts: how about riddles? double entendres? remember this one? :)
As I was going to Saint Ives,
I crossed the path of seven wives.
Every wife had seven sacks,
Every sack had seven cats,
Every cat had seven kittens,
Kittens, cats, sacks, wives,
How many were going to Saint Ives?
Math: Math riddles
Grapes of Math is a wondrful book,too!! Even older students could create their own illustrated math riddle books perhaps?Brain teasers might be a good *mysterious connection too*
Science: mystery aromas...put cotton balls in yes...film canisters*g* wtih scents in them..how many can they identify while holding a slice of orange in their mouth? Or taste testings of similar pops..which one is the pepsi or coke?
how about Escher?? where are those darn stairs going anyhow?? :)
Lewis Carrol is a good tie in too...http://www.lewiscarroll.org/logic.html
ok..back to housework now*g*