Party Pranks

Im haveing a graduation (from grade 8 to grade 9) party. There are 5 other girls comming to sleep over. I am 13 right now and would really like to have pranks to pull on people. Right now me and my dad have one trick. Because we are playing manhunt in the forest near my house, my dad is going to dress all camo and hide in the bushes making noises, but for me one is not enough, and I dont want gross, or dangerous pranks can you help me?