I just printed out this bit by Seth Godin and posted it to my monitor:
If you buy my product but don’t read the instructions, that’s not your fault, it’s mine.
If you read a blog post and misinterpret what I said, that’s my choice, not your error.
If you attend my presentation and you’re bored, that’s my failure.
If you are a student in my class and you don’t learn what I’m teaching, I’ve let you down.
Worth remembering. Exceed expectations. Overfull requirements. Anticipate. Humble Pie.