Once when I was bagging groceries I somehow stabbed a half gallon carton on the bag holder and it spurted like I hit an artery. And a few times a gallon of milk has just exploded. For no reason. Somehow it's dry in their cart and the second an employee touches it, it gushes everywhere.
Milk is such a bitch to clean up. It stays wet forever, gets kinda sticky, and smells weird.