1. Barcelona, Spain: Referring to Barcelona as "Barca." Flickr/Jorge Franganillo / Via flic.kr "We cringe every time we hear that." 2. Paris, France: Calling the newer of Paris’s two main airports “Charles de Gaulle." Flickr/Mathieu Marquer / Via flic.kr "When I lived in Paris, nobody called the newer of Paris’s two main airports 'Charles de Gaulle.' What did they call it? Well, just the town CDG has been built on: 'Roissy.'" 3. New York, New York: Going to Times Square. Flickr/Todd Lappin / Via flic.kr "Locals would not be caught dead hanging out here." 4. London, UK: Sitting right next to someone when there are many empty seats around. William87 / Getty Images "In a nearly empty tube carriage, sitting on an empty seat right next to someone when you can sit somewhere else." 5. Atlanta, Georgia: Calling it "Hotlanta." Southern Drone Group / Getty Images "Saying/singing/rapping/thinking “Hotlanta”. It's Atlanta. If you’re feeling extra, Atl. That's it. Thanks." 6. Dublin, Ireland: Spilling beer on the floor. Paul Faith / AFP / Getty Images "No matter how drunk, no matter how crowded the pub is, a local will always be able to handle at least 3 pints at a time without spilling." 7. Toronto, Canada: Pronouncing it “To-ron-toe” instead of “Tuh-ronno” Leopatrizi / Getty Images "Locals always drop the second T. It’s such a part of our identity that Canadians from other parts of the country, even if they’ve lived here for years, refuse to drop the second T. " 8. Bangkok, Thailand: Entering someone's home without taking your shoes off. Linda Raymond / Getty Images "Generally, in most places in Thailand, it’s customary to take your shoes off before you enter someone’s house (in most SEA countries actually). When people just brazenly walk into someone’s house without realising the proper etiquette, it’s kind of a give away." 9. Portland, Oregon: Using an umbrella when it's raining outside. Flickr/Dave Crosby / Via flic.kr "You sort of stop caring about the mist, and just wear wool that stays dry.""Locals just wear a light rain jacket, and are on their way. No local will cancel plans because it's raining outside or wait for the rain to let up." 10. Moscow, Russia: Whistling indoors. Tap to play or pause GIF Tap to play or pause GIF Atlantic "This casual gesture immediately identifies you as a non-local. This is because the Russians believe that by whistling you're blowing your wealth away." 11. Singapore: Sticking or throwing out chewing gum in a public space. Flickr/Joe Ruiz / Via flic.kr "It is illegal for chewing gum to be sold in Singapore and Singaporeans are notoriously afraid of violating the rules." 12. Berlin, Germany: Putting your feet up on the seat next to you. Franz12 / Getty Images "While it doesn't explain origins, the idea that Germans are high in uncertainty avoidance is the conventional wisdom on the topic. Avoiding uncertainty means creating and following rules (like respecting public property) and procedures." 13. Edinburgh, Scotland: Pronouncing the "G" at the end of Edinburgh. Flickr/barnyz / Via flic.kr "The '-burgh' at the end of a place name is pronounced '-burra,' as in 'Edinburra,' not 'Edinberg'." 14. London, UK: Ordering a full English breakfast. Flickr/Kathryn Yengel / Via flic.kr "A tourist will order a fry-up for the ~experience~ but everyone else is perfectly happy chugging Crunchy Nut cornflakes straight from the box." 15. Melbourne, Australia: Calling these "flip-flops." Flickr/Monik Markus / Via flic.kr "Okay foreigners, it's time to get this straight: THESE ARE TWO THONGS! And calm down England, we are not walking around commenting on revealing underwear all the time." 16. Amsterdam, Netherlands: Walking on bike lanes. Flickr/San Francisco Bicycle Coalition / Via flic.kr "Do not walk on the bike lanes. Seriously." 17. Cairo, Egypt: Wearing camouflage clothing. Flickr/Wendy Yu / Via flic.kr "I don't know what it is but for some reason, a lot of tourists walk around like they're about to go on some super dangerous, ultra important journey through a jungle. They wear big hiking boots, thermal backpacks, etc. They also wear very camouflagey stuff." 18. Tehran, Iran: Not trying to haggle supermarket prices. http://Flickr/OXLAEY.com / Via flic.kr "Bargaining is so extreme in Iran that supermarkets have actually raised their prices by a lot to keep their old profit margins." 19. Madrid, Spain: Eating lunch before 1 p.m. Flickr/El gran sueño / Via Flickr: elgransueno "We are well aware that it's our meal times that are unusual, but they are very culturally ingrained and expected to be followed. In big companies where there is an office cafeteria, or in schools, 1 p.m. is a normal time for lunch — it's considered earlyish but more or less in the middle of the work day. Otherwise the normal time is 2 p.m., or even 3 p.m. on weekends."