It's not even about the units, you could put this in ounces and even fewer people would know.

People don't know caffeine dosages because nobody has to know that - they know what coffee is, and that's normally the strongest source of caffeine by a long shot. Even a huge Monster energy drink is less caffeine than a regular one cup of coffee, and that's well understood to have a kick to it. It's specifically marketed as an energy drink, so much so that people are often more intimidated by Monster and similar drinks than they are of coffee.

I have never heard of a single product, ever, that has had more caffeine, either by volume or by container, than coffee. I'm sure some existed before the Panera Death Lemonade, but I'm certain it's fairly obscure and also that it is marketed as absolutely fucking you up with energy.

I guarantee that the previous inhabitant of the spot next to the soda machine was some sweet and unsweet tea, or other juice, uncaffeinated.

It's really just an attempt to make a product unexpectedly more addictive to increase their sandwich sales. They thought slapping the miligrams on the box could shift their legal liability to the consumer - that maybe a judge will rule that people just have a responsibility to understand caffeine dosages before having a lemonade with their shitty sandwich. Maybe they'll be right