Answer: Telepathy
Explanation: I would want to read someone's mind, so I know what their thinking and feeling. Though I would never tell them I know what their thinking, it would be nice to know. Say you were telling your crush you liked them, and they started laughing at you because their friends were. I would want to know what they really thought about me. If they actually liked me and were embarrassed to say so, or if they genuinely didn't. I also think it would be funny because you could say what you best friends thinking before she or he says something about it. I think it would be cool to be on the same page with people all the time.
Hope this is a good explanation. :)