This isn't really a riddle but it's interesting.
Read the following sentence though once.
FINISHED FILES ARE THE RE-
SULT OF YEARS OF SCIENTIF-
IC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS.
Now read it again and count the number of F's in it. How many did you count?
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Save Chip - Don't let Sarah win!
Official Titterer of the Laughing Hyenas