Source : Free On-Line Dictionary of Computing

field circus
     
        A derogatory pun on "field service".  The field service
        organisation of any hardware manufacturer, but especially
        {DEC}.  There is an entire genre of jokes about DEC field
        circus engineers:
     
        Q: How can you recognise a DEC field circus engineer with a
        flat tire?
     
        A: He's changing one tire at a time to see which one is flat.
     
        Q: How can you recognise a DEC field circus engineer who is
        out of gas?
     
        A: He's changing one tire at a time to see which one is flat.
     
        See {Easter egging} for additional insight on these jokes.
     
        There is also the "Field Circus Cheer" (from the {plan file}
        for {DEC} on MIT-AI):
     
         Maynard! Maynard!
         Don't mess with us!
         We're mean and we're tough!
         If you get us confused
         We'll screw up your stuff.
     
        (DEC's service HQ is located in Maynard, Massachusetts).
     
        [{Jargon File}]
     
        (1994-12-01)