When you see the words "Joey" and "Whoa" together, you just automatically say it in THAT way. Joey's way. Did you know it wasn't originally supposed to be said that way? It was supposed to be like a surfer/Keanu Reeves type of whooaaaa.... But it wasn't playing well with the audience, so Joey was asked to try something new, and the rest is history!
Watch the video of him telling the story here: