I've been drinking at a bar for a few hours. I walk to the bathroom which is two buildings over and shared by several establishments. I open the bathroom door and uhh there's someone in using it who forgot to lock the door lol. so I close it.  A kid comes up and waits in line behind me, I think probably 20 years old. With no hesitation he immediately says to me (in japanese) 日本人ですか？ and I am like uhh there is obviously no way he thinks I'm japanese. and this is such an odd conversation opening line to someone you've never said a word to and who probably doesn't understand what you say in the first place. So I respond えーと… トイレの中の人ですか？

and he just laughs. and then he... really starts laughing. and then he starts crying and laughing. and then the person came out of the bathroom and i went into the bathroom. and when i came out, he wasn't there anymore. the end.