A Cessna Citation X jet pilot with 4 hours of time to kill flew this
unusual pattern:

http://flightaware.com/live/flight/N...757Z/KICT/KICT

And a Gulfstream V (GV) jet pilot with 8.5 hours of time to kill flew this
pattern:

http://flightaware.com/live/flight/G...538Z/KATW/KATW

(First noted he
http://www.vansairforce.com/communit...ad.php?t=27779 )

Tis a mighty vast canvas to draw something only discernible with the aid of
high technology.