Programmer's who have you retesting cables allover the home when the problem exists in software. 4 hours later "oops".
Cabinet Makers who have never seen an amplifier and happened to forget to drill pass thru holes in the 4" hardwood.
Electricians who think one outlet is enough in the control room and butcher the ceiling so bad you have no place to run cable.
Drywallers who throwout your speaker rings and pull your wire thru a hole. And dont forget the way they botch every plaster ring so your control device or wall plates never fit properly.
Cable,phone,alarm guys who dont notice that all your cables are neatly ran. Instead they take the most direct route and unplug your surge protector to make room for that over sized power supply.
Home owners who change device locations as the wind blows while wondering whats taking so long.
General contractors who call you out to the job late and point the finger at you when his guys arent done pouring the basement.
Product vendors who sell directly to clients or the clients electrician as if that makes it ok.
Pizza places for never having an all you can eat buffet.
People who ramble on about problems they cant avoid.