Tim Burton's dark comedy, Beetlejuice is a popular cult film and a Broadway hit. There are a plenty of costume choices form the movie and play that will stun any partygoers on Halloween night.
First of all, don't say his name three times! Second, the essence of Beetlejuice is in his hair, so make sure to pick up a messy, whitish costume wig and add some creepy yellow and green stains near the roots to bring out your ghoulishness.
Using white face paint, completely cover your face to create the effect that you are a ghoul from the undead. Finish by creating large dark circles around your eyes, either with more face paint or black eyeshadow.
A striped suit with a hypnotic design like the one he wears in the movie might be hard to come by, so you may just have to get one from a party store. If you're stubborn and want to make one on your own, you could always get striped fabric from a craft store and put on together.
Beetlejuice wears large black boots and dons a sickening, devious smile that lets you know he is up to no good. The character is known for his odd behavior, so get creative with the construction of the costume. As long as it generally looks like the character (green hair, striped suit,) you'll be good to go.