Halloween Idea

I grew up in a college town, and one Halloween our doorbell rang and we opened the door expecting to see trickortreater but what was in front of our open door was another door! Like, a full-on wooden door, that had a sign that said "Please knock." So we did, and the door swung open to reveal a bunch of college dudes dressed as really old grandmothers, curlers in their hair, etc, who proceeded to