Quote Drift is the phenomenon where you have a quote you enjoy from a movie or T.V. show and you go around repeating it constantly for an extended period of time. But when you finally get around to watching the original piece again (an event you’re looking forward to) you discover that the original is quite different from what you’ve been saying.
This is quote drift.
Each time you said it there were slight deviations, and over time it morphed into something totally separate from the original. You’ve seen it happen many times; now you have a name for it.