Dear 100 Hour Board,
Why do I always feel so kawaii desu when I watch anime?
Kawaii Desu...I just like saying that. It makes me feel so Japanese.
Considering that kawaii desu translates as "it's cute," your question doesn't make any sense. Although I assume that's the joke.
If you want to sound really Japanese, make sure to emphasize the u at the end. (Actually, that was sarcasm. Please don't. It's almost always silent at the end of desu.)