Because I infected you with a malware (RAT) / (Remote Administration Tool), some time ago and since then, I have been observing your actions. The malware gave me full access and control over your system, meaning, I can see everything on your screen, turn on your camera or microphone and you wont even notice about it, yes such things exist, you can google it! I have also access to all your contacts, I collected everything private from you, pictures, videos, everything! Then I removed the malware again, right now its no longer on your computer. I MADE FEW EMBARRASSING VIDEOS OF YOU (through your webcam), ONE SHOWING YOU MASTRUBATING!!!
I can send the videos to all your contacts (email, social network) and publish all your private stuff everywhere! You can prevent me from doing this! Transfer exactly: 2000$ with the current bitcoin (BTC) price to my bitcoin address.