I can think of 2 examples.
One (I think I said this before) - quite recently. The prof was talking to the timetabling team about his course. He then "forwarded" an email on to me and added his own comments about how these folk were incompetent, were sabotaging him and so on. Except...he didn't forward it to me. He had in fact replied to the timetabling team. Guess who's teaching on Friday afternoons nowadays...
Second, a colleague and I were dealing with a student who was basically lying to us. It was regards a coursework assessment he was trying to get out of and it was just paper-thin excuses. My colleague replied to me about how the lad was being dishonest, wasting his time, really needs to pull himself together, and so on. But he had included the student in the reply. On reflection, I thought it was probably a good thing for him to see some tough love.