I was a very weird child, too, and did weird things when they tried to test me, too. This can be bad, because its impossible for a tester to get something accurate if you are just playing games with them. It's worse if they aren't smart enough to realize you are playing games with them, or that you just don't "get" the idea of going through psychological tests.

It is extremely important when you test very smart children that you explain, in detail, what you are doing with them and why.