But no, the cheats we're talking about are a little more sophisticated than that -- and not completely unlike a Jedi mind trick.
How to Win:
Professional Rock Paper Scissors players (yes, they exist) find that humans are fairly predictable when it comes to simple games like this. For example, it's well known that a rookie player is always more likely to start with rock, simply because rock looks more badass. Intermediate players can use this knowledge to counteract or rule out rock depending on how experienced their opponent looks.
Also, players in general are statistically less likely to throw scissors at any given time -- so all things being equal, you should go with paper.
Then, statistics show that players will often use the throw that would have won the last turn. After you throw down the paper, watch them come back with scissors.
Really advanced players, however, don't need to guess what you're gonna choose because they can decide that for you.
"Yes, this is the best way to use my superpowers."