At one place I worked at, a family came in, ordered lunch, and seeing that they were the only ones remaining in the dining room after they ate their meal and the busboy had cleared their table...
proceeded to change their baby's diaper on the dining table in the middle of the dining room! 
Oh, and I'd like to point out that the GRANDPARENTS were standing right there beside them, handing over the powder and wipes.
The manager yelled at them and threw them out. Then proceeded to sanitize the table. I wonder what would have happened if he had not caught them doing that??
Also at this same place, when I glanced out the window of the kitchen, I saw a lone toddler heading down the dirt road into the forest -- I quickly retrieved and returned him to his - until then - oblivious parents. (And what? No tip...?? Next time, the kid becomes a statistic, I tell ya!
)