Four surgeons are taking a coffee break.

1st surgeon says:  "Accountants are the best to operate on because when you open them up,
                    everything inside is numbered.

2nd surgeon says:  "Nah, librarians are the best.  Everything inside them is in alphabetical
                    order."

3rd surgeon says:  "Try electricians, man!  Everything inside THEM is color coded."

To which the 4th surgeon, who has been quietly listening to the conversation, says
"I like engineers....they always understand when you have a few parts left over at the end."