I'm the "somebody else" in "that's somebody else's job".
My official title is Senior HVAC Engineer, although I haven't actually performed any detailed engineering work in close to 6 months.
My unofficial titles are:
Project Manager (here, do my job, and send it back to me to send to everyone else, thanks!)
Market Researcher (hey, give me a list of every company within 250 miles with 15MM in revenue and 1500+ employees, thanks!)
IT Systems Administrator (hey, Jim's phone won't work, the conf. rm internet won't work, I need a thingy to plug my stick thingys in, and my computer won't boot up, thanks!)
Web Designer (hey, we need to redesign our website to reflect a new division that will constitue 45% of our total revenues next year, can you do this by tomorrow? thanks!)
Maintenance Technician (hey, I need this whiteboard hung, and can you look over this punch list of things that are supposed to be completed, thanks!)
Forklift (hey, can you take this box downstairs, thanks!).