καὶ ἀποστέλλει δύο τῶν μαθητῶν αὐτοῦ καὶ λέγει αὐτοῖς Ὑπάγετε εἰς τὴν πόλιν, καὶ ἀπαντήσει ὑμῖν ἄνθρωπος κεράμιον ὕδατος βαστάζων· ἀκολουθήσατε αὐτῷ,
(Mark 14:13)So he sent two of his disciples, telling them, “Go into the city, and a man carrying a jar of water will meet you.
κεράμιον is anagram of Markion.
So Couchoud:
The strange command given by Jesus to his disciples to follow a man carrying a keramion of water, and the rather mysterious manner in which he gives them to understand that they are to follow this man—i.e., Marcion, whose name is a sort of anagram of keramion—instructs the Christian to observe the Marcionite rite in which water only was drunk in the eucharist (R. Stahl).
(Creation of Christ, p. 188, n. 369)