20. Four flavors of Nuka Cola exist: Quantum, Clear, Quartz, and Victory; five if you count the Fallout:Tactics variety Cherry. Quantum seems to be a direct reference to Pepsi Blue which, like Nuka Quantum, posed health risks to those who drank it.
The Top 50 Things You Never Knew About Fallout, Pt. 1
Think you know everything about Fallout? You totally don’t.