[Elecraft] Off topic question

[David]

A friend asked me yesterday if I knew why hams would be sending the
following 

"Cq cq callsign callsign test test"

In cw over and over and over again I told him I did not, I could not
find anything on the internet about it so I thought I would ask the most
august body of hams for information. The signals where heard around
12:00 am midnight on 160m anyone know what was going on? Or why?