Expedia recently revealed the results of its 2015 Hotel Etiquette Study. Conducted by independent global market research company GfK, more than 1,000 Americans answered questions regarding tipping habits and top hotel guest behavior complaints.

Hotel tipping habits widely vary. Twenty-seven percent of guests report they do not tip hotel employees during their stay. Housekeepers are the most-tipped employee, with 51 percent of respondents saying they tip for housekeeping services. Slightly behind, 40 percent of guests tip for room service delivery and 31 percent tip the valet. Many take liberties when staying at a hotel: taking toiletries home (26 percent), smoking in a non-smoking room (5 percent), haggling over room rates (6 percent) and sneaking in extra guests overnight (9 percent).

Here are the top hotel etiquette violations, from most to least bothersome:

1. Inattentive parents – 67%
2. Hallway hellraisers – 64%
3. Complainers – 54%
4. In-room revelers – 52%
5. Bickerers – 26%
6. Poolside partiers – 22%
7. The loudly amorous – 21%
8. Hot tub canoodlers – 20%
9. Business bar boozers – 12%
10. Elevator chatterbox – 6%

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