M: How long will this take?
D: Three weeks.
M: That's too long, we have to demo at a trade show in two weeks.
D: Fine, we can take out half the features.
M: No, we have to demo in two weeks, with all the features, end of story.
D: It can't be done, end of story.
M: Do it anyway.
D: We can't, what your asking for is literally impossible.
M: Fine, I'll loan you three more developers.
D: No, that won't help. Haven't you read The Mythical Man Month for crying out loud?
M: Of course it will help, how can it not help?
D: Nine women can't make a baby in one month.
M: That's not really relevant, get all the features done in two weeks.
D: Then why did you bother asking me how long it would take in the first place?
M: Just do it.
D: ~grumble~ -- storms off in a huff.
...
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...
...
...
...
2 weeks later.
M: Is it done?
D: No, I told you it wouldn't be done.
M: Oh, OK. Well how long will it take to finish?
D: Another week.
M: OK, fine.