Setting swimming pools on fire.

This is an idea that came up in a cartoon and it has kinda latched onto my brain; how would you go about setting a swimming pool on fire?

Like, a concrete pool sunk into the ground in your back yard? Gasoline will rest on top of the water pretty well.

Not that I'm telling you to do this or even how, but there are certain places you can go on the interwebz that will tell you how to make it even nastier than just gasoline...

this seems like a stupendously bad idea.

Yep... just about anything that is flammable and liquid will burn if poured over water. You have to do it slowly for some flammable liquids or they'll mix with the water (alcohol for example) and then evaporate before it separates enough to burn.

We used to do this when we were kids in our pool. Gas worked the best, alcohol not so well and the flames were invisible during daylight.

"It takes an idiot to do cool things, that's why they're cool."

Feed me chili with beans and I will show you.

There are things man was not meant to meddle in.

This is similar to a question posed in a 1976 super-8 monster film I wrote, wherein the evil scientist threatened to destroy the company's most valuable asset - it's gravel pit.

CEO: "How do you destroy a gravel pit?"
Foreman: "Um. Fill it in?"

I'd suggest a block of elemental sodium and potassium and just chucking it in the pool from behind a blast screen

Nah, just stick it in your pocket and jump in.