Plastic in my food

I was at Barney's on 1/10/2015, and ordered a Chicken Schnitzel which came with chips and veggies, unfortunately I was unable to finish my food, so I took it to work for lunch, and almost cut my mouth open with a sharp piece of plastic that was in my spinach. The plastic looks like a seal from a bottle - ewwww other people's germs in my mouth! - UTTERLY DISGUSTED!