I could pass Big Piston's test. CFIs have done it to me. My Blanik L33 Solo used to have issues from being tied out no matter how I covered or taped the ports. I have had the airspeed indication fail in a super cub, and in a C140 just like Pilot DAR's picture. I have flown a lot of glider PIC in the back. In a 2-33 you can see the ASI and altimiter if your passenger is small enough and they look out the right side. In a Krosno you can only see the reflection of the vario in the canopy.
Still, I have to assume I am a bad pilot because I sometimes reduce flaps on finals. Done it many times tugging in the pawnee, where I did every landing power off. Also done it in the Arrow, PA18 and C140. Plus my flapped glider.