This week's challenge was to set the shutter to a long exposure and then move the lense out or in at the same time. 

The trick came when trying to coordinate my shutter hand with my lense hand.  Took several tries to get them going at the same time.  Good thing I used a tripod or it would have been moving not just refocusing.

Maybe this represents the feeling when you miss seeing the stop sign until the last moment...Panic.