You heard the news on tv that a unknown entity has entered earth with size of 3cm height and it's exploring the earth and no one knows what it's intention, and meanwhile you were watching tv, you see the alien and it looks like a parasite approaching you slowly and stand back as to protect yourself, and then the Parasite talk to you using telepathy and said

You shouldn't be afraid... Just let me in and I will protect you and fulfill your desires...