Chocolate soda, as the name suggests, is a carbonated beverage with a distinct chocolate flavor. It is typically made by combining chocolate syrup, soda water, and sometimes a hint of vanilla or other flavorings.

So like a cold fizzy and viscous chocolate milk.

It's a thing. There's a reason you don't see it very often anymore, though.

I'd guess kind of like an egg cream, which is a drink containing neither eggs nor cream.

Superman dives headfirst into the lava plug of a supervolcano, the impact causing the plug to crack and crumble, releasing thousands of years of volcanic pressure. Lava spews miles into the air, the caldera itself collapsing as, after thousands of years of erosion, the plug was the only thing still holding it up. The lava runs like oil on water, engulfing everything it touches. No one is safe, no one survives. Children scream as their flesh melts. Lovers hold one another as the ash smothers them alive. Pets asphyxiate from the toxic gasses. Vehicles melt. Homes burn. The cloud of ash ascends to the heavens and God weeps as volcanic winter sets in; causing famine and mass starvation as crops can no longer grow under the limited sunlight and frigid temperatures. A mass extinction event is triggered. Half of the extant species die as the perpetual winter disrupts their natural food chains and causes them to starve or freeze. Superman climbs out of the volcano to face his challenger, somehow miraculously still standing in the midst of the chaos. He puts on his most charming, charismatic grin.

Home insurance salesman: "Y-you've proven it, Superman..... you've proven it...."

Drink it!

I guess to prove he doesn't need to be insured against wiping out all of humanity with a global pandemic?

It's just... some of those are airborne. If it's every deadly microbe.