PM: "Please try to prioritize this request that we made last Friday at 5pm over all your other high priority stuff we know you're busy and we should have requested this 3 months ago... but now we need to deliver next week and well we need it"

5 minutes later "When can you deliver that?"
Another 5 minutes later "Sorry can you give me that delivery date? We REALLY need it"

Well maybe if you leave me in peace and I can concentrate on my job rather than answering silly requests I can make up an idea of how much time I need to deliver... but of course I'm just a code monkey, I press some randome keys and the magic happens.