Lol I like doing that when my parents are in the room , just saying mot of my sentence in English while the most important word of the sentence is in Japanese so they have no idea what I'm talking about .u.
I also walk up to my sister, or just cut her off in the middle of a sentecnce: "I've told you time and time again, I am not kaycee! YOU SHALL REFER TO ME AS BOCCHAN!" Her "Ball-chun?" Me: *facepalms* "just...go.......hug a tree or something."