If a face is swapped with a perfectly identical face, did it even swap at all?
This is the type of philosophical question the 21st century has forced us to answer.
A recently uploaded YouTube video of two Russian twin brothers attempting to face swap is turning heads, simply because no one can tell whether they're completely failing, or just succeeding really hard.
However, as Sergey moves in and out of the frame, it becomes easier to tell that the app is certainly working -- scarily well, in fact.
Since being posted on Monday, the clip has been viewed over 30,000 times, all by people presumably thinking the exact same thing.
Check out more fun with face swap: