ANSWER:

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 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? Pass this on to anyone you feel would enjoy this.