Ahh, but they do! They don't list the option on their menu, but if you pull through the drive through and say "#X meal, Supersized", you still magically get a large fry and drink.

Oddly enough, chains like Hardees and Wendy's have started calling their medium fries/drinks "small" and using that as the basis for their meals. Small to McDonalds is kid sized, small to Wendy's/Hardees is medium in McD land. And yet those other chains try to upsell you to what is basically a Supersized meal by calling the standard small....go figure.

Nonetheless, it's all crap food. But oh so satisfying!