Or in this case, the f-ing letter I took all the time to write. So, a customer sends a ticket in with a request. I complete the request, and send back a letter with a bunch of information, including the fact that his request takes 24 hours to update in the system. 3.5 minutes later, I get a call from the same dude, asking why it was not working. I tell him the 24 hours to update thing, and mention that the answers to the questions he is asking are in the letter I sent him. He replies, "oh, I got that, but did not read it. I figured I would call instead."
The hell? Thanks for wasting 15 minutes of my life, jerk.
*for those who don't know, RTFM means Read the Fucking Manual