Someone at work showed me this the other day and i thought it was cool.
Count the F's in the sentence below (Count them ONLY ONCE!):
FINISHED FILES ARE THE RE-
SULT OF YEARS OF SCIENTIF-
IC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS.
How many F's did you count?
There are six F's in the sentence.
A person of average intelligence finds three of them.
If you spotted four, you're above average.
If you got five, you can turn your nose at almost anybody.
If you caught six, you are a genius.
Most people's brains will just skip over the OF's and not count the F's from them.