Last year my friend had this awesome party.  It was based on the Blair witch project. First you take your street name(like Danbury) and add, witch project. So it would read: The Danbury Witch Project. You invite a bunch of your friends and have a tent set up somewhere outside.  Ask three or 4 boys from your school to be the guys dressed in black.  They are the one's you try to catch throughout the whole party. Have your mom/dad/older sibling video tape the whole thing.  You want the camera to move around so it's like the movie. In the tent have a gross looking sandwich with red dye like blood on it and then dare the girls to go in a sing a song really loud. Have the video taper lead the kids on a walk where on the way there are brains and a knife on the path. Also have a walkie talkie hanging from a tree and have one of the boys talking through the other in a spooky voice. Make sure one of the girls hear it and takes it off the tree. Have the boy sort of give hints as to where he and the others are.  Have them dress in black with scream masks on.  The whole time you try to catch them and bring them to the birthday kid's house. Then you watch the whole tape of the party.  This must be done at night!!!  This was for a 13th birthday, but it can be done for many ages.  Have Fun!!