Signs of a manipulator:
Points out how someone else is better than you.
Warns of potential jeopardy that you may not be able to avoid.
Points out your mistakes, or reminds you of past mistakes, no matter how insignificant they may be.
Tells you how awful other people are and the nasty things they've done, especially if they do the kinds of things you hate.
Sudden increase in friend-like attention, followed by an equally sudden drop in interest.
Comes across as sexually available, but never quite seems to follow through
Has a sad, sad story to tell, full of pathos and misfortune.
Gets in your face, shouts at you, insults you, and makes threats.
Finds the least things to flatter and praise you for.
Manipulators use these tactics in order to get you to do something for them. It is always for their personal benefit, whether for financial gain, political influence, or to just the shear joy of seeing if they can pull your chain and make you perform for them. Usually, the behavior stops either when they get what they wanted from you, or when it becomes obvious that you won't play their games. Sometimes, however, a manipulator will change tactics, and try to play you from another angle.
A person who displays one or more of these behaviors now and then may not be a manipulator, but someone who practices most of them most of the time may very well be trying to provoke you into doing something that you would not normally do.
Never mistake niceness for interest, interest for friendship, friendship for committment, or committment for permanancy.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.