One time, I fell asleep on a couch and woke up a couple minutes afterwards, asking Mako what he was doing.  He seemed puzzled by the question, so I asked again, this time slightly louder.  He seemed more confused and I got annoyed because I was thinking “what’s so hard about my question?” Then, I realized I was talking to him in Japanese.
Sometimes, I confuse people and get annoyed by them for being so slow.  
Last week, my japanese friend asked me if our mutual japanese friend’s name was spelled in Japanese with tenten (=double dot) added to ‘tsu’ or ‘su’  (Both pronounced as Zu).  I was reading something in English and I told her that it was spelled with tenten on Z, the alphabet Z.  She seemed puzzled, so I repeated my answer, even saying tenten on “Zet” to make it clear.  There was a moment of silence and she said, “Did you say tenten on *Z*?”  She’s got a lifetime to tease me on this.  Cho dasai..
Yeah, my brain is as messy as my room…