If memory serves me correctly,

I have been asked to show my ticket on the Tokaido shinkansen going from Tokyo to Hamamatsu (taking the Hikari train).

Also been asked for my ticket travelling to either Kyoto/Osaka on the Tokaido shinkansen from Tokyo. Same goes for when I went to/from Yonezawa from Tokyo on the line that goes through Fukushima and switches over to go on to Yamagata (the name escapes me right now but I'll update my post when I remember it, darn it! :P )

Sanosuke!