Those were spirits that were probably moving the planchette on the ouija board. Besides if you do use one, you're opening a portal to the spirit world, and you don't know what kind of spirit you might get. Evil spirits are everywhere and in the spirit world as well, so you might want to be vary carefull with these kinds of things. Any psychic, or spiritual activity that you do or partake in, spirits will be attracted to your energies, such as playing with the ouija board. If you or one of the people involved in playing with a ouija board start having weard thoughts, feelings, hear noises and voices, or have bruzes, bite marks, and scratches on your body, that might be a sign of possession. You can also experience paranormal phenomena, such as things flying across the room, lights turning off or on, and doors opening and closing by themselves. If you're going to continue this activity, I'd suggest that you do some kind of protection rituals. Just be vary careful with the ouija board, because these evil spirits and demons will not hesitate in fucking your world up.