Here is 1 saying encoded using a letter for letter replacement:

RZCN'K SF UMK ZBB KRF IMMBJ CN KMSN MN MPL JCAF? ZNA RZCN'K KRZK Z YCU
FNMPUR XZVMLCKO CN ZNO KMSN?
-- XZLD KSZCN, "RPHDBFYFLLO ICNN"