Ok, so I know things like this are up on Youtube for humorous purposes, but I think this is a great example of what happens to a language when you subtract prosody and intonation. English speakers will have a difficult time understanding a speaker if they do not have the contextual clues that speech rhythm and melody offer.
English teachers often focus on consonant and vowel pronunciation changes. English learners tend to focus on this as well as it seems more straightforward to learn. You can see that this is simply just part of the picture when it comes to being understood. Without the music and beat of a language, meaning is quickly lost.