The point at which after listening to enough country music, different songs start sounding the same. Sometimes you start singing one song only to notice that you're singing an entirely different song 10 seconds later.
Guy 1: "Hey man nice country music mix! The songs all blended together"
Guy 2: "Wait. Those were separate songs?"
Homeless guy: "It's the country music singularity. Just like the BIBLE says! RWEWER THE END IS NEAR!"