It's Just A Rock.

Item #: It's a rock. Why, Jerry, why?

Object Class: Keter Entirely Normal.

Special Containment Procedures: This thing could just be in someone's lawn or something, but noooooooo Jerry said "It has to be contained in clearance level 5 containment cell, with guards protecting it 24/7." It's literally JUST A ROCK!

Description: It's a rock. It does absolutely nothing. Jerry, are you okay? It's a normal rock, with absolutely no anomalous properties and you're claiming it's a Keter SCP, requiring clearance level 5 to access? I feel like you need to see a doctor.

This rock can be dangerous, but only in the case that someone chucks it at somebody's head or something. Jerry, I'm seriously scared for your health. How is this anomalous? It's an ordinary rock. No anomalous properties, no weird origin. Just a rock.