Changing requirements. Us: "Well, we just got the roof on and all the walls sheetrocked!" Them: "We want all the walls moved now." Lately it's also been the

Changing requirements. Us: "Well, we just got the roof on and all the walls sheetrocked!" Them: "We want all the walls moved now." Lately it's also been the strangely recurring request to do the impossible. I've actually been asked to use cross site scripting ("like the hackers do - why can't you do it") to implement features a customer just had to have.