I've never used a measuring cup for cooking rice. Like the old timers, I used a "cup" and learned to measure with it. Give me another "cup" and I'd be in a world of hurt. Anybody got a bag of Uncle Ben? Please share the instructions as I've never read anything on cooking rice.
BTW, at Conner Prairie Hearth Cooking Class I learned that a "cup" was not the same as a measuring cup. It was a "cup" and one learned to cook by eyeball. So, what was one man's cup could be another man's shot glass. The story related above probably involved a large cup which resulted in too much rice in the pot.
I also came across an account by one soldier whose "cup" measured a quart. Cup should then be read as a cup and not a unit of measurement.