Dilbert: This is not the deal we agreed on. Man: I forgot a few things on the first estimate, but you need them. Dilbert: I only picked you because you had the lowest price. Man: Yes, but not the vendor selection is done and it would be too much trouble for you to start over. It might even damage your career because you delayed the project. You could go to the second-highest bidder, but those guys would do the same thing to you. Dilbert: Gaaa!!! I have no choice! This is blackmail, not commerce! Man: We call it "sales." I'll need all the cash in your wallet, too.