We have something very similar on the door as Staff/Students walk in. It has been there for more than 2 years and only about 2 - 3 weeks ago did an individual member of Staff notice it/comment on it. Sadly the humour was lost on her and she asked were we seroius about point 6 [our version]
"When you are getting no dial tone at home call Computer Support. We can fix your telephone line from here"
This list is two years old but the sad thing is it is still true.
forwarded to the rest of my colleagues, awaiting the laughter ;)