As anybody who's ever had a job will tell you, work isn't always fun. In fact, sometimes it can be downright scary.

The staffing firm Accountemps surveyed 420 office employees on what their biggest workplace fear is and found that 28 percent are most afraid of making a mistake on the job. That's followed by 18 percent who fear dealing with difficult customers; 15 percent who are afraid of conflict with their boss; 13 percent who are terrified of having to speak or present to a group; and 13 percent who are afraid of conflicts with their co-workers.

Seven percent had other fears and a lucky (or delusional) 3 percent had no workplace fears at all.

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