We have a lab at work where we test the hardware and software that our client uses in the field. Because of the nature of this project, it was appropriate to put a nice picture of an eagle by the door. Recently we expanded our use of this lab, and it became appropriate to add a picture of an owl next to the eagle. I found nice owl picture and posted it, but I was worried how people would react. (I've had a few bad experiences in the past, where an attempt to add a light touch to some grueling development work was perceived as an insult by some of the programmers.)
In this case I needn't have worried. The day after I posted my owl, someone added another picture: Tweety Bird.