*
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.

There is no catch. Many people forget the "OF"s. The human brain tends
to see them as V's and not F's or just doesn't see them at all.