Another Yardstick of Intelligence

Read this sentence:

FINISHED FILES ARE THE RE-
SULT OF YEARS OF SCIENTIF-
IC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS.

Now count ALOUD the F's in that sentence. Count them ONLY ONCE: do not go back and count them again. See below...

ANSWER:

There are six F's in the sentence. One 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 most anybody. If you caught six, you are a genius.
There is no catch. Many people forget the "OF"'s. The human brain tends
to see them as V's and not F's. Pretty weird, huh? It fools almost
everybody.