It is not a regular occurrence, but several times I have been at Boeing Field when a local Pitts Special is doing pattern work.  Most times I have been a long way from it so not able to try and get any useful shots.  That changed a little while back when I was near the terminal building.  The pilot flies patterns with a steep climb out, a downwind leg and a steep curving descent to land followed by powering up and flying low to gain speed before repeating the process.  I decided to give some low shutter speeds a good to see how things looked.