What is this thing I found on the floor after a party

https://preview.redd.it/a5tpiez8ddsh1.jpg?width=1536&format=pjpg&auto=webp&s=a7f323a4310db08ad9b79f3538d1c82d49450884

We had a party at a house, and afterwards I found this plastic thing on the ground. I have no idea what it is