When I was manager of the last bar I worked at, I had someone scream at me so loud she was spitting in my face because we wouldn't allow them to cut a cake they had brought with them to their party they had reserved. The thing is, we told them in advance what the cake fee was, and they said they wouldn't bring a cake. They tried to sneak the cake in (kind of hard to miss a giant white box), and tried to secretly cut the cake without us noticing.
We finally agreed to let them eat the cake, but we wouldn't supply any plates or utensils. Everyone was so wasted that they just ate it with their hands. Surprisingly, no one smeared a single crumb in spite on our art work or furniture.
The whole cake thing is REALLY FUCKING annoying. Of course you have to pay a fee for bringing in your own dessert to a restaurant! Why is this ANY kind of surprise to anyone?