I have always wondered what the proper etiquette for flushing at night is, especially late at night. At my own house, I'll just flush, but what about when I'm a guest at another house? Should I flush and wake everyone up in the house, or should I not flush, let them sleep, and leave them a suprise in the morning? There are many variables such as who you are the guest to, your relation to the person who's toilet you are flushing, and what you would be flushing, but what is the proper etiquette for this tough situation?