I also have to wonder why Fire Flowers work underwater (are they GREASE fireballs?), and why Mario could originally breathe underwater indefinitely but no longer can. And how come you can only go down certain pipes, when plenty of others are big enough to fit into? Inquiring minds wants to know!
Speaking of Mario games, I might start re-watching my Captain N and the New Super Mario World DVD set pretty soon. Is anyone still interested in reading my reviews? I'll do a general post on the series regardless, but if no one has any desire to see my opinions on individual episodes, I might forgo them for the time being.