Oh, I’m going for damage.

Do it with nails. (Most) Nails are made of steel. You likely won’t make it anywhere near the MRI bed before they start doing their thing though

Spite! Spite is the word of your undoing!

I need some time to develop an equation. Like 4 cats for a single person is a lot but I wouldn’t consider it crazy. That being said, 8 cats is quite a bit for 2 people. So maybe something regressive like 1-4, 2-7, 3-9, 4-10, 5-11, 6-12 but past that, you’re running a commune that likes cats. Threshold

You are a crazy cat person if you have more than 4 cats per capita with a maximum of 12 cats per household.