A few flights after I qualified, and I felt I needed to take my girlfriend on a short trip. Being the "expert" in the aircraft, I was very diligent in completing all my checks. At the hold, with all the run-up checks completed, I decided to add a bit of carb heat since there were a few in the circuit to land, and ATC were keeping me. A few aircraft come and go, and I get clearance. On the climb-out I'm thinking it's all a bit sluggish, and the attitude does not feel right for 79kts, and I'm getting worried a little. Finally get to 1000ft, only to turn off fuel pump, to notice carb heat still on. Doh!
Lesson to learn - get into a strict routine - it you do something out of the ordinary, don't move on to another task...
The other cracker I did was switching on the radio, but not the volume - asking for taxi about 10 times before I figured it out. The other cracker is moving off the stand with the fuel lever set to off - you can go about 3-4 feet in a Warrior...