From H.K. in Canada:
One day, apparently the public washroom on our second floor was occupied when an older lady desperately needed to use it. So instead of waiting, she decided to defecate in one of the nearby garbage cans. After doing so, she came downstairs to the circulation desk and told us what she had done, and that we should "do something about it." She then left and never came back. (Some of us speculate she was a mental patient at the nearby mental hospital.)
Luckily our janitor arrived shortly after to clean up the mess.