None—unless one of your cheerful sorority sleepovers takes a drastic turn into horror.
These things do happen sometimes. One moment you’ll be having a pillow fight in your underwear, and then BAM. You’re taken out with a machete by a guy in a plastic mask.
Look around. Have you just moved into a new house? Has the power suddenly decided to go off? Is there creepy background music warning you of your immediate doom?
If any of the above applies I suggest running. Now. Or give the killer one of your blonde sisters. Sacrificing her will give you a fighting chance. If you're blonde yourself, we're sorry. You're as good as dead.