I'm glad MC saw that, wait maybe it's the author that set up in the first chapter that makes me remember that kid with insects ... lol they shouldn't have such a clean train, you might need need those pee, trash and semen for that kind of situation... just imagine all the cockroaches and ants you can kill on that train if that train wasn't so clean... (ahh but aren't we always killing bacteria all the time? I guess bacteria doesn't count huh?)