Way too much free time!

If you've ever seen the Diet Coke and Mento's phenom before... this was their newest exploit...



and while you're pondering the validity of spending that much time on brain distractions.. focus on this and predict what should fill in the next 3 blanks:

Z O T T F F S S _ _ _

If that one was too easy, try this one... (I still haven't figured it out, but my peers have the answer). Post your answer in the comments, and I will make a NOTE of the correct answer:

One is Three, Two is Three, Three is Five, Four is Four, Five is what?