I've always been meaning to post this picture which has been floating around on the net for quite a while now. How fast can you find the man (click picture to enlarge)?
Supposedly:
Doctors have concluded that, if you find the man in 3 seconds, then the right half of your brain is better developed than most people.
If you find the man between 3 seconds and one minute, then your right half of the brain is developed normally.
If you find the man between one minute and 3 minutes, then the right half of your brain is functioning slowly and you need to eat more protein.
If you have not found the man after 3 minutes, the right half of your brain is a mess, and the only advice is to look for more of these types of exercises to make that part of the brain stronger.
The man is really there. Keep looking!
Taken from here.