How to disprove free will using basic logic

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BasilZero said:

If everything happened for a reason ONLY , than there is no free will, if everything happened for NO reason than there is no free will. Therefore the end result would be, things happen for a reason AND for no reason which end up being resulted in "Free Will". Its like day and night / light and darkness, one cannot exist without the other.

I think (from the striked through paragraph I made) I was trying to say Randomness itself is a result of free will, otherwise if nothing random occurred in real life, than it would be plain, boring and predictable, therefore no free will.

Edit : Either I am right or I just confused myself XD

Bolded: That's a pretty funny equation. (no offense ;)

Underlined: Think about this: When the big bang occured, there was not a single life-form. No decisions could be made, thus either randomness or determined patterns made materials move and finally shape planets and eventually life. If the free will is what shapes randomness (which I really, really don't believe) then you just proved that there is a god. I'd say that it's the other way around though, and that randomness/determined events is what shapes the free will.