Life pro tip: While humans are indeed vulnerable to gamma rays from uranium, it's usually all around more expedient to just hit 'em with it. And for that, many rocks will do, even just plain old feldspar.

Technically, kryptonite is also our kryptonite.

If you can avoid that rock for around 60 billion years, it'll be almost entirely lead, and then you can mock it. 'Not so tough now, stupid rock'

Dudes be like "LMAO Green Lantern's weakness is just a colour!'

My Vrother in Christ

SO IS YOURS

My weakness isn't Uranium, you can just throw a rock at me and I'll probably die.

Doesn't even have to be radioactive. Too much salt will kill you, as will any rock with sufficient mass and velocity.

Hmm, you know, I’ve never thought about it, but I do avoid movies with The Rock in it. You may be onto something!

…wait, no, I liked The Rundown.

…and Jumanji 1 wasn’t bad.

It doesn't even need to be radioactive/kryptonite.

Imagine getting hit down there with a rock. Yeah, I'd call that a weakness.

I mean the rock isn’t going to kill you. It’s the radiation that does, so no, our weakness isn’t a rock.

No way, the only thing scientists have proven that can kill me is shellfish. That’s it’s. So far, nothing else.