Manager: Why are we missing our deadlines?

Me: Cause we don't own any of the codebase that we work on and have to literally beg to other team for code reviews and deployments, for which it takes long mail chains and meetings. An even before that we(devs) have to explain to them what/why are we doing things, because our Product managers are a bunch of NoGood AHoles. And after all that we finally do some development, in whatever measly time we have left.

Manager: I know all that, tell me why are we missing our deadlines?