Let's go even deeper: "Ship of Theseus" applied to intersubjective phenomena GP described. In one sense, any institution, culture, law or religion that outlives the founding generation is fully Ship-of-Theseus-sed already.
Probably by the time the brain of the speaker has processed the thought.
The mere passage of time means that the original meme no longer exists in its original form. Communicating a single idea to another individual creates a wholly new slightly mutated copy of the original idea.