What’s the scariest smartest thing your pet has ever done?

I had a pet praying mantis for a while. Immediately after I captured it, I put it in a paper cup, put plastic wrap over the cup, then secured it with a rubber band before poking holes in it.

The mantis pressed one claw against the plastic wrap, testing the tensile strength, then left it alone.

I've had dogs and cats who were smarter, but that mantis knew way too much for being that tiny.