The computer operator would then have to go behind the tubes with a brush and literally "debug" the computer. The term stuck as a term for troubleshooting computer problems. And it all goes back to the days of tubes. 
Good story though!!!!
From the US Navy:
The First "Computer Bug"
Moth found trapped between points at Relay # 70, Panel F, of the Mark II Aiken Relay Calculator while it was being tested at Harvard University, 9 September 1945. The operators affixed the moth to the computer log, with the entry: "First actual case of bug being found". They put out the word that they had "debugged" the machine, thus introducing the term "debugging a computer program".
In 1988, the log, with the moth still taped by the entry, was in the Naval Surface Warfare Center Computer Museum at Dahlgren, Virginia.
Courtesy of the Naval Surface Warfare Center, Dahlgren, VA., 1988.
U.S. Naval Historical Center Photograph.
http://www.history.navy.mil/photos/images/h96000/h96566kc.htmSo the first bug was accross some relay pins, but as tubes replaced relays the heat and light attracted more bugs and the problem became a common occurance.
Rich, I think your BS dectector needs to be recalibrated....... maybe it has a bug in it.
(All kidding aside, I really like that graphic. I wish I could get away with inserting it in some of the legal documents I have to prepare.
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