What to Wear: If you want to pull off this look, you better start now. I imagine it's going to be pretty hard to get your hands on a mask like that, so you'll have to figure out a creative way to make it. Don't forget to paint on the pentagram! The ratty black wig shouldn't be hard to find, nor the baggy high-waisted pants. Add another one of those starchy English collars and a long-sleeved, lacy shirt.
How to Act: This clown's just, like, really good at hiding. In the back seat of cars, on the upstairs landing, etc. Just hide everywhere and scare everyone.