Example 7: Lying outright
We users are not all useless morons. Some of us actually know what we're doing, and have a clue as to what the problem was. An example: I bought an IOMagic DVD drive back in March. Recently it has refused to read CDs. I contacted tech support, and was told several times over that "You're not supposed to read CDs in that drive" despite the fact that all over the packaging and documentation are the words "Plays any type of CD and DVD media". The CD laser turned out to be broken. Please, treat us as though we have some inkling of what we're doing until you find evidence to the contrary. We're not all mouth-breathing dips.