Email from Byter Philip, commenting on the post about help desk complaints:
In relation to the so called help staff, I employed a young bloke once who worked for a technology support company as a field technician. He told us how he would go out to people and that the company had a code for simple jobs to charge the account. He said that when they would arrive at the site and discover that there was actually nothing wrong, they would phone in the job as a PEBKAC problem. The PEBKAC stood for “problem exists between keyboard and chair”, being the operator.