I used to whistle at work, when I was an commercial Trainee.
I was woking in the Budget department with about 40 people in.
I was whistling and enjoying my work, when this old miserable boss looked at me and becloned me into his office.
He just said "You are annoying me with your whistling. I don't want to hear it again."
He didn't and I stopped whistling from then on.
I could have been a top line whistler if it hadn't been for that git.