Worst job

What is the worst job imaginable? What characteristics make a job worse than any others? Are boring meaningless jobs worse than jobs that result in you being covered in filth all the time? If a dirty job provides an essential service does that make it better than a boring meaningless job that does not require you to cope with physical discomfort?

Is there any job in existence that is worse than Redundant Peon at the Redundant Department of Redundancy?

Inquiring minds want to know.