Why does master Roshi want the plane to stop before the second Tenkaichi tournament? In Dragon Ball, master Roshi and the others take a plane trip over to Papaya island for the 2nd Tenkaichi tournament (in the series). During the plane-ride, master Roshi seems to become extremely upset and wants the plane to stop. I watched this a few times, and I guess I just didn't understand this part.

Why does he want the plane to stop?
If you're talking about the manga, Master Roshi indeed wants the plane to stop, but the reason is quite obvious to the reader: he wants to poop real bad (Chapter 113). This is so clearly stated that I am not sure this is what you were asking about. Maybe it is not so clear in the anime?