I remember once some arsehole gave me grief for a week because a document on the web portal I built wouldn't print for her at home. She escalated it to the CEO, to the Chairman, who then both gave me grief about the problem.
Turned out her printer wouldn't print anything. It was her printer that was the problem, absolutely nothing to do with what I built. Repeatedly told her this twice a day for the week she'd ring up ranting and raving. Even though I'd never met the woman, never seen her computer, didn't even know what type of printer she had, and the computer wasn't the property or anything to do with the charity I worked for, it was all my fault and I should fix it.
Do you think I got an apology from any of the people mentioned? Did I fuck.