Here's a fun and simple test that might reveal a bit about how nimble your brain is. I've seen it in a few places, and it's probably been send around through chain email at some point, but the best web presentation I can find is at Creativity at Work: How do you put a giraffe into a refrigerator?.
1. How do you put a giraffe into a refrigerator?
The correct answer is: Open the refrigerator, put in the giraffe and close the door. This question tests whether you tend to do simple things in an overly complicated way.
2. How do you put an elephant into a refrigerator ?
Wrong Answer: Open the refrigerator, put in the elephant and close the refrigerator.
Correct Answer: Open the refrigerator, take out the giraffe, put in the elephant and close the door. This tests your ability to think through the repercussions of your actions.
3. The Lion King is hosting an animal conference, all the animals attend except one. Which animal does not attend?
Correct Answer: The Elephant. The Elephant is in the refrigerator. This tests your memory. OK, even if you did not answer the first three questions, correctly you can surely answer this one.
4. There is a river you must cross. But it is inhabited by crocodiles. How do you manage it?
Correct Answer: You swim across. All the crocodiles are attending the Animal Meeting! This tests whether you learn quickly from your mistakes.
Silly, yes, but perhaps useful. I doubt the attributed source or accompanying statistics are true.