What annoys you the most when you are traveling? As the summer vacation season approaches, Expedia has released its 2018 Airplane and Hotel Etiquette Study, which identifies the behaviors that travelers find the most maddening.

Expedia surveyed more than 18,000 people worldwide and identified the most reviled behaviors among travelers. According to the New York Post, those include “going barefoot while flying (90 percent of the respondents loathed that) and being stinky, in general (43 percent). Other hated in-flight behaviors include kicking, bumping or grabbing at someone’s seat; commandeering the shared armrest and bringing your own, pungent food to consume on the plane.”

Specific offensive foods cited by people who posted on FlyerTalk.com included beef curry, eel sushi and bags of greasy, hours-old Five Guys burgers.

The global survey found that South Koreans were most likely to get drunk after flight takeoff and Europeans were the first balk when passengers in front of them reclined their seats.

When it came to hotels, the top complaint was bedbugs, with the presence of used condoms placing a close second. Other egregious behaviors that disturbed travelers were “hallway hellraisers,” “elevator chatterboxes” and the “loudly amorous.”

Many noted that they like the tiny bottles of shampoo and other hotel amenities. Those will soon be disappearing in some hotels, with chains such as Marriott International and InterContinental Hotels switching to wall-attached dispensers.