A thunderstorm in Guatemala began simultaneously with the eruption of Mount Fuego

Hard to tell in the various shots how much eruption has already taken place, but at least some of the lightning might be generated by the volcano itself. Static electricity from the erupting particles causes lightning, which is known as volcanic lightning or a dirty thunderstorm.

https://en.wikipedia.org/wiki/Volcanic_lightning?useskin=vector

Those both sound like really good names for drinks.
The volcano is very likely causing the thunderstorm. Thunderstorms develop when convective activity pushes hot, moist air to high altitude. The high heat from the volcano very likely induces the convective flow necessary to generate the storm.

I'm sorry but "Mount Fuego". Pretty low-effort name. Do they also have a Lago de Agua? Just sayin.

Meanwhile in the UK...

"White Cliffs"

"Green Park"
- Or the entire state of Vermont.
  
  Literally Verde Monte
  
  The green mountain state.
- I the USA "central park"
Not that I know of, but we do have another volcano named Agua :) Really though, Guate has plenty of unique and wonderfully cultured names - some are just a wee bit simpler than others.
they have an agua volcano right nearby

And religion was born

Right?

How could primitive humans draw any other conclusion than God from that kind of spectacle!?

We have come so far.
- Yeah and if they saw that, they'd immediately think "the gods are pissed, we must have angered them by something we did."

That is pretty common. https://en.wikipedia.org/wiki/Volcanic_lightning

Imagine seeing this in ancient times. I'd think the world is ending.

Ancient times? If I had stepped out and seen that this morning shit would be shat.

I mean, someone has to be the first person to watch the beginning of the end of the world, right? My lizard brain would have instantly decided I was the lucky person.
- Me too, but mainly because there's no active volcanoes near me
  
  We did have a massive dry-season lighting storm out of nowhere once which sparked a wall of fire surrounding my city, burning over 8000 square km and blotting out the sun.
  
  In 2020.
  
  Definitely felt like the end of the world.
  
  Also set up one of the greatest reddit exchanges I've ever seen
  
  Commenter 1: these fires were sparked by 10,000 lightning strikes over the course of a day during hot, dry weather
  
  Commenter 2: PG&E [our electric utility, known for both high prices and sparking wildfires] execs breathing a sigh of relief for this one
  
  Commenter 3: I dunno, pretty suspicious. Has anyone ever seen PG&E execs and 10,000 lightning strikes in the same room?
  
  Commenter 4: one can dream

Damn, that wizard is mad as fuck. What did the peasants do this time?

They brought Kim Kardashian as their virgin sacrifice.
Went bowling using his best orb

It's like when you go to the toilet but then the water splashes back in.

It's like that.

Poseidon’s Kiss
- Neptune’s Nibbles

That's one of the most metal things I've ever seen.

Brutal

What do you expect that happens if a volcano throws dust into charged clouds?

You still need a volcano and charged clouds. So you probably don't see that everyday.

Imagin seeing that stuff a couple hundred years ago, without any knowledge about the mechanics behind it. Wild!