I think Japanese language's accent is extremely different with English accent because the languages are remarkably far apart, unlike Dutch and Spanish and other languages of Europe and that would be the reason why his accent is pretty bizarre.
However I like how he jumps at the end and no matter how many times I watch this clip, it always makes me grin uncontrollably.
でもこれを日本人が聴くとなると意外に聞き取れるのが不思議だな。