The Blocked Password Scam involves one or more persons walking around typing "Jagex blocks your pass! Look! ******* try it!" but instead of typing their password, they just put asterisks.
However, Jagex has reacted by making sentences that have a player's password do not appear at all, to prevent this scam. Although, scammers have found another way around this, such as "Jagex blocks your pass if it's said backwards! *******". These users should be reported under Rule 3.
Note that scammers say "pass" instead of "password" as JaGeX has filtered the word, "password".