It's not always a candidate's fault when a job interview goes south.

Hiring managers can commit a litany of sins, such as interrupting interviews to answer phone calls, failing to take notes, acting bored or distracted, bad-mouthing their own companies, bullying applicants, or asking "gotcha" questions for no reason at all, say human-resources consultants. The cost of poor interviews ranges from bad hires to alienated job applicants. At worst, untrained hiring managers can open their employers to lawsuits by asking questions...