Expedia just released the results of its 2015 Hotel Etiquette Study, which asked 1,022 Americans to share tidbits about their behavior at hotels and to evaluate the behavior of other hotel guests.

67 percent said parents who let their kids run wild are the most aggravating hotel guests, 64 percent said “Hallway Hellraisers” were the most irritating, while 54 percent of Americans complained about guests who berate hotel staff over minor inconveniences.

Survey respondents were also asked about some of the things they did in hotel rooms, such as hoarding toiletries, smoking, sneaking in extra guests and taking home hotel property, but I was most intrigued by the section on tipping.

According to the survey, 51 percent of Americans tip the hotel housekeeper, but 27 percent do not tip hotel employees at all.