And mutagens. If pregnant women are around your rebellious metal can of koolaid, their babies will be born all deformed and smelling like artificial fruit.
If you line up a lot of those metal cans they could be mistaken for a long-range missile silo and that could be seen as an attempt to foment unrest which is bad in our current volatile society. It can lead to hunger and homelessness all for want of a little plastic bottle.