At a place I used to work we had optional "pizza parties" as a reward for employees during work hours. Then many people started grabbing pizza and going back to

At a place I used to work we had optional "pizza parties" as a reward for employees during work hours. Then many people started grabbing pizza and going back to their desks to work, or to head out for a break, etc. Management got upset that people weren't staying in one place to eat and talk, so they made it mandatory to stay in the room for anyone that was eating. It was pretty clear then that the pizza wasn't a reward for employees, and was something intended to achieve some other purpose (e.g. teambuilding, work discussions, etc.).