How to Crack a Sewage Pipe

It's all basically dependent on him getting down to that sewage pipe and being able to crack that pipe. Presumably, I don't think he could have practiced yet. How does he know it's only going to take three or four hits to break that pipe? And if it doesn't, what's the plan? That's my biggest one. He gets in the pipe and he looks left and he looks right. What happens if he's like, hey, Warden, funny story. Here's your suit covered in shit. Sorry about that.