One time when my music theory professor was a student in college, he had to accompany an extremely rude soprano for a recital. She treated him like dirt during rehearsals. Just before going on to perform, she made some really snide remark to him that ticked him off, so he transposed the piece up a half step. She cracked three times.
Always be nice to your accompanists, folks.
There is a special place in hell for people that are rude to their accompanists
About a Russian piece we were working on…