I've hacked your account and have your e-mail password. I have video of you watching porn. I will send the video to your contacts if you don't pay me Bitcoins.
I like these two contradictory sentences: If you want evidence, reply with Yup! and I will send out your video to your 6 friends. It's a non-negotiable offer, thus please don't waste my time and yours by replying to this email message.
