Agencies Joke of the Day SHARES By Matt Van Hoven on May. 29, 2009 - 12:15 PMComment Got this one from a spy of mine a few weeks ago. Q: What is Sir Martin Sorrell’s nickname? A: June 21 Click continued if you don’t get it. I didn’t, at first. Image More: “An Interview with Sir Martin Sorrell” June 21st is the summer solstice, or the Shortest Night.