I found this video over at A Welsh View. It shows how unbelievably busy the trains can get in Tokyo.
I’ve only had the misfortune of being on such a train once. When it’s the last train you don’t really have much choice. Needless to say it wasn’t very pleasant. Made worse by the fact that I’d been out drinking and badly needed the toilet. Although I hasten to add that despite my discomfort, I didn’t, ahem, embarrass myself.