Haha, it's not a big secret or anything, it's just my "thing". I love karaoke, and I also have a bit of a fascination with foreign music - French, Italian, Japanese, Korean, Mongolian etc. From pop and opera, to heavy metal throat singing. Whatever catches my fancy basically. And unlike "normal" people who may just listen to some J-pop or something, I actually like learning all the lyrics, practicing until I memorize everything, all so that I can sing along and perform confidently... in the shower.
Perhaps some day I might come across a karaoke place with a good foreign song collection, and that will be the day I finally get to show off, but until then, I will continue to keep learning and singing in the shower lol.