One time, I saw a spider crawling in my bathtub. I doused it with mineral oil and set it on fire.

I also had ants in the aforementioned bathtub. So I boiled a big pot of water, went out the ant hole, and steamed the fuckers alive. They never came back.

Btw, there was no malice in my intentions. It was more of a macabre curiousity getting the better of me.