While at a party, we were waiting for pizza we had ordered. When there was a knock at the door, someone opened it to find the pizza delivery man. While waiting for someone to pay, police approached the door, came into the house, threatened to arrest everyone and demanded to speak to the owner. The house was immediately quiet. The police continued to threaten that everyone had to leave, that they could arrest everyone immediately. I asked them on what charge they could make an arrest (I am not the owner of the house) and the officer told me, "We can go outside if you'd like to find out." I said I was just asking what allows you to arrest everyone. He said he didn't have the ordinance number, but if I wanted to be a lawyer tonight, we could "go outside". I had not been drinking.