Walter and Peter in “Unfinished Business”

Walter

You are continuing to work on this infernal device; the one depicted in the blueprints!

Peter

That's correct. I'm running diagnostics.

Walter

I thought I made my position clear. I do not want to find out what its purpose is! You have no idea what it does! You might as well be building a nuclear bomb in my lab!

Peter

I don't think that's entirely fair, do you?

Walter

Well, fine! If you end up breaking the universe, this time it's on your head!