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

JZ T MGRPGM JZ QTHTZT, NQPDP TDP NWF RYGSSR FO BQDJRNFKQPD BFSGMLGR,
"FZP WQPZ QP WTR T LFX TZC FZP WQPZ QP WTR T MTZ."
-- MTDY NWTJZ