Mud Wall Jutsu

When you spend weeks building a wall out of dirt, wait for it to harden, and then kidnap children to throw against your homemade wall of dirt and mud.

Friend 1: "hey, I've been working on my 'mud wall jutsu' for a while but need some help picking out the kids to throw at it."
Friend 2: "ye sure, what are you looking for, I've got loads of black ones in my basement if that's what your looking for."
Friend 1: "nah, I'm looking for some new borns to start with, just to see if my wall will hold..."