¿Source?

I don't understand. ¿Can you explain that to me?

I love that movie.

But if there's a break in the pipe it'll silently flow downhill, filling low lying areas, possibly killing many people without any immediately obvious indication of what's causing people to gasp and fall dead.

Thanks for the heads up, I'll tell people to keep a look out.

That's a pretty steep mark up for something that grows wild.