Brainteaser that actually teases
Seriously, I usually hate these things. Try it:

TRY THIS!

Quick Eye Exam; this will blow your mind

Just do it – don’t cheat

Try this, it’s actually quite good.

Now fast, count the number of F’s in the following text:

FINISHED FILES ARE THE
RESULT OF YEARS OF SCIENTIFIC
STUDY COMBINED WITH THE
EXPERIENCE OF YEARS

Managed it ?

Scroll down only after you have counted them !

OK ?

How many ?

Three ?

Wrong, there are six.

Read again !

FINISHED FILES ARE THE
RESULT OF YEARS OF SCIENTIFIC
STUDY COMBINED WITH THE
EXPERIENCE OF YEARS

The reasoning is further down . . .

The brain cannot process the word “OF”.