With you on this, Ascend Charlie and gums!
I once had unreliable airspeed in an F-4, called knock it off and requested RTB on the wing. My alleged leader took us down, levelled off in cloud even though we could see gaps beneath us, then flew the approach but decided to fly a go-around and a pairs visual circuit as it would be 'good training'...ar$e! My nav lost his cool and reminded the idiot that we had a REAL failure and that this practice bleeding wasn't a good idea! Cause of the failure was the static connection on my nav's ASI coming adrift, admitting cabin pressure into the static system.
Got my own back a little later though - this time the same person lost HIS instruments and I led him down for a night pairs approach. This time landing off the first approach!