I read a book from a famous piano tuner for concert artists who when he played with one conductor liked his piano tuned to A-442 or slightly more, rather than A-440 as he wanted to be "on top of" the orchestra. Often the conductor was furious, but it went on more than once the story goes.

I am not sure of the pianist's point of this, accept that instruments out of tune are very irritating to me and the conductor's position directly near the piano and orchestra was probably equally so. Maybe it was just to irritate the conductor.

I think I might have found another way. Maybe a hot foot, or some other prank, but not in piano tuning.