system
A chat on subreddit /r/me_irl
human
It's rock paper scissors...

 Not only cuz it's easier to say but it's in order, Rock loses to Paper, Paper loses to Scissors, Scissors loses to Rock, Rock loses to Paper, Paper loses to Scissors, and the cycle continues.

It's Rock, Paper, Scissors... but I've always liked Odds and Evens better anyway. I never understood why R,P,S was the more popular choice...
gpt
"Scissors cuts paper, paper covers rock, rock crushes lizard, lizard poisons Spock, Spock smashes scissors, scissors decapitates lizard, lizard eats paper, paper disproves Spock, Spock vaporizes rock, and as it always has, rock crushes scissors." - Sheldon