I was watching the Canada France Hawaii Telescope webcam last night (7/19/11) and saw this anomaly in the lower left hand corner. The images are 1-2 minutes apart. I did not catch the frame when it first appeared although a frame 12 minutes preceding showed nothing unusual. Way to slow for an airliner, Perhaps a blimp, or...? There appeared to be some spectators as seen on the right side of the screen. Other Hawaii Telescope webcams are on my site.