I was FO on an aircraft following a very big merger.
We operated the monitored approach system. My captain came from a company where they did not.
C: "D'you mind if I fly my own approach?"
FO: (In warning tone) "Well, YOU'RE the Captain."
FO: (on short finals) "YOU'RE HIGH AND FAST ON A SHORT WET RUNWAY!"
Despite warning, Capt lands and bursts all maingear tyres. I thought we were going off the end.
Funny old thing; I never heard another word about it.
JFDI!