Started taxi with one wing tie down still attached and aircraft started to turn in spite of operating full oposite rudder! DOH
Distracted on base after spotting another aircraft conflicting on long final without communicating (later found out that the other pilot didn't have a working radio so didn't want to join the circuit) put flaps away and flew an orbit to allow it to land (it was a very quiet uncontrolled airfield), joined final again forgetting to put the flaps down at all and wondering why I was sinking fast. In hindsight, I should have aborted the landing and flown a full circuit again.
Flying a revalidation check ride with an instructor in a PA28, parking the aircraft and then pulling up the flap lever - I must have thought that it was the handbrake in the car! and yes, he did notice!