In Marvels Agents of S.H.I.E.L.D Agent Coulson is put through the TAHITI programme to

Bring him back to life. As part of this he has some memories replace to help him return to his old personality

This has the side effect of whenever someone mentions Tahiti he will say the phrase "It's a magical place."

Later when

Cal has his memories altered he also utters the phrase.

Presumably it is implanted as part of the process but why put in this phrase/ Is it to allow quick identification of patients or for another reason?