Office types that shouldn't work in an office

There are many, but let's begin with the most annoying:

The phone walker. These are people who cannot take a call at their desk. They pace all over the office, talking on the phone. that's bad enough, as they tend to obstruct access to doors, copiers, printers, etc., but it gets worse as they tend to talk loudly, disrupting everyone else. They also tend to peremptorily demand pen and paper from whatever random cubicle dweller they happen across.