That one's huge.
I remember two stories my professor told about IQ tests and cultural anthropology.
One was a question asking you to exclude the item that did not belong with the others. The choices were pencil, hammer, axe, nail (or something like that.) Westerners were expected, and usually, chose pencil because it's something you write with and not a construction tool like the others. Non western cultures, particularly less developed ones, would choose nail... because you don't use any wood to make it.
Perfectly logical, correct answer. But not the one the test designers anticipated anyone giving.
Another was a cultural anthropologist attempting to give an IQ test to a tribal culture in Africa. Everytime the individual taking the test would get stumped, he would get up, take the test with him and go over and discuss the problem with a group of other men. The anthropologist ran over and told him, you can't talk to other people, you have to try to solve the problem and answer it without help. And the test taker responded, "but this is how we come up with answers to problems."