The other side of the coin
In one company I worked for, I was on a small panel that evaluated any software we were thinking of buying. The scenario was always the same, the super-confident salesperson would spout about the ease of use, the huge productivity gains to be had and the miraculous ROI. Then the poor bloody techie would attempt to demonstrate the miracle software... To be fair, after much sweating and naked panic, something would usually appear on screen, at least temporarily. It was fun, in a perverse way, to watch the salespersons eyes as the prospect of a juicy commission slinked away.