So let's give this man a round of applause:

Seriously. He's been studying the McGurk effect for 25 years (he says it). And what has he come up with? That we might not always see what we hear. And vice versa. Again; the dude's been studying the mouth movement of the sound "ba". For 25 years. Then tested to replace it with the "va" mouth movement. Ba. 25 years. Congrats man.