So I clicked on this ad that said they were going to give me Bitcoins for free.
It is a generator, they said.
I waited for a couple minutes for them to generate my free Bitcoins. And voila, there it was.
But wait, for me to be able to receive my Bitcoin, I have to send a confirmation transaction fee worth 0.00350 BTC, roughly about $9.
So I closed the window and called it a scam.