Most unprofessional experience at work?

<about an hour ago> Went into the bathroom to do the morning deuce and there was crap all over the back of the seat. WTF!? Did you miss!? In our part of the building its only devs and network admins, so again, dudes, WTF!?

Oh, and never spit your gum out in the urinal. Its not a new, fun target for you to shoot at. *Somebody* is going to have to pick that nasty thing out. Our maintenance guys have hard enough job than cleaning up after 'so called' professionals.