Did you know that there are World Championships of Rock-Paper-Scissors? Now you do. My favorite part of the site is the section on trainers (because you really need a professional trainer to play RPS):
Some players choose to retain the services of a personal trainer. Experienced and talented trainers can be invaluable in building an RPS career, but beware of charlatans. There are many “trainers” available for hire who have never been either a competitor or referee and have no qualifications to speak of. Before you sign a contract, find out who you’re dealing with.
Consider yourself warned.