1) People who page you to their extension over the intercom then either are on the phone for 10 minutes or leave their desk.
2) A project manager schedules a meeting today to come up with hardware and software req's for a new customer installation. I do due diligence in estimating needs and coming up with a preliminary BOM and network layout. So time for the meeting comes we're all sitting there and the PM calls from the airport: "Oh, I forgot I was going to Brazil on vacation today. Can you run the meeting?"
3) No, I do not want to spend all day ridding your son's home computer of all the spyware and viruses infesting it. I will do it after hours. For $75/hr.
4) No, I will not spend my time whitelisting all of your friends and relatives email addresses in our enterprise spam filter so you can use your corporate mail account for personal use. I have 30 Gmail invitations left. Want one?
5) "Remember that project I had you work on for 3 months a year ago that I had you scrap halfway through? Turns out we need it finished. By Friday."
6) No, I can't guarantee I can take your iPod apart and replace the battery with the one you bought on eBay and have it actually work. But I'd really like to try.