Dave, my muse for my Tokyo adventures, suggested in one of his emails to me that I should “somehow” get to Shinjuku station on a weekday morning and try to get on the JR Yamanote line bound for Shibuya somewhere just before 8. In fact, I think his instructions are worth quoting: “The first challenge is to somehow get on the rush-hour Yamanote train between 7:50am and 8:00am. HA! The second challenge is to somehow get off at Shibuya (about three stations from Shinjuku). HA HA!!”