One of my sons lost his watch in the ball pit and was very upset. We dug and dug in those balls, trying to find his watch. Instead, we found vomit, food, faeces, and other stuff I do not want to discuss.
I went to the manager and raised hell. Come to find out, the ball pit is only cleaned out once a month. I have doubts that it is even done that often. My kids will never play in another ball pit again.
Story Number 1 : The Happy Pit
Story Number 2 : The Snake in the Pit