I saw on TV some kid lose convincingly against a RPS champion when the kid had been given a prepared (random) list of moves to make ahead of time. That can't be explained by strategy - it was either coincidence or it's possible to cheat by seeing which way your opponent's hand is unfolding and change your move at the last moment.
Or the losers were unintentionally signaling their moves beforehand.
Here's the new thread for posting quotes, with the usual rules: