I know this sounds odd, but...
Once, i was building a lion exhibit in one side of the zoo, then that dread sign of "Zookeeper **** can't reach the poo" appeared; i didn't gave it attention...but it kept appearing all over and over again. So, i went to check the exhibit (Elephants) and the zookeeper was standing in the middle of a lot of poo! It was all over the place, and the zookepeer was acting like he wasn't seeing all that.
It's kind of weird, isn't it?