That moment the sales guys ask if a humongous new feature is doable. And doesn't wait for your answer before adding: "Well so you know, I'll already promised it to the client for last week"

Yup, i deal with this all the time.

Is it really a career suicide to:

- Get up from your desk and go to superior
- Say: sales promised "this" for last week and just told me now, the estimate is x days from today.

? For real, I really don't get all this "sales has the last word" rants, I would probably get fired from a job that does that if shit happens this way.