I once tried to carbonate my own chocolate soda by putting a yoo-hoo through the knock off soda stream.
The results were… Well, I don’t use the words “made of Satan’s smegma” lightly, but I imagine that’s about what it’s like.
I did enjoy the one I got at the old school pharmacy soda fountain, though. That was good.
Adding the spicy tang of carbonation to chocolate milk takes a very special mind.