In university I had the lab computers set up to change my wallpaper to some scantily-clad supermodels whenever I logged in. Somebody complained to a prof that my wallpaper was obscene (it was a GUY believe it or not) and I got called into the prof's office. After I explained that there was no nudity he let me go like it was no big deal.
After that I always made sure my wallpaper was prominently displayed every time that guy walked by
These days? No wallpaper...