Here's a little test, please no cheatting 
Read the following text and count the number of "F":
+++++++++++++++++++++++++++
FINISHED FILES ARE THE RE-
SULT OF YEARS OF SCIENTIF-
IC STUDY COMBINED WITH THE
EXPERIENCE OF YEARS
+++++++++++++++++++++++++++
Go down only if you finished counting them.....
How many where there? Three?
Nope, SIX! and it's not a joke.
The explaination is that the brain, for some mysterious reason can't process "OF"
Whoever that can find the 6 "F" at the first shot is a genius, 3 is the normal, and less than 3 is for the 'slow' people
Sadly there aren't any patches for this

Read the following text and count the number of "F":
+++++++++++++++++++++++++++
FINISHED FILES ARE THE RE-
SULT OF YEARS OF SCIENTIF-
IC STUDY COMBINED WITH THE
EXPERIENCE OF YEARS
+++++++++++++++++++++++++++
Go down only if you finished counting them.....
How many where there? Three?
Nope, SIX! and it's not a joke.
The explaination is that the brain, for some mysterious reason can't process "OF"
Whoever that can find the 6 "F" at the first shot is a genius, 3 is the normal, and less than 3 is for the 'slow' people
Sadly there aren't any patches for this