Another common situation I've encountered is this one: They don't really want "it". They say they want someone to do "it", they hire someone who has done "it".

Another common situation I've encountered is this one: They don't really want "it". They say they want someone to do "it", they hire someone who has done "it". But then that wasn't really what they wanted done. I think I can also draw the hypothesis that the more convinced they say they want "it" and/or the bigger the "it" they ask for, the less they actually want it when the time comes.