Spuga Cola
It might've been a clever plot to recycle toxic waste. It
might've been a conspiracy to poison the peoples of the
Milky Way. It might've been a cruel practical joke. Even
today, no-one really knows for sure.
Advertised as a "refreshening soft drink" and sold by
dealers working on their own, Spuga Cola was far from
refreshening or soft - some argue that it was not
even an actual drink. The real ingredients of Spuga Cola,
or "Spuge" as it was called, are still a mystery to the
Galaxy despite several attempts at analyzing them, some by
respected scientists.
The stuff itself was black, and while sometimes it was
runny like a liquid, it could also be rigid like a jelly.
Consuming it usually resulted in various kinds of nausea,
indigestion and allergic reactions, and some even reported
hallucinations, delirium and addiction as side-effects.
Most don't even dare to imagine the possible long-term side
effects.
As for how it tasted, those who happened to be unfortunate
enough to taste it can only describe it with two words -
"unbearably sugary". It is also said the aftertaste could
linger on in one's mouth for weeks.
Needless to say, local colonial authorities soon outlawed the selling of the substance.