Foreign countries
Going to a country where you barely speak the language is stressful enough without worrying about the different gratuity customs. Here’s a shorthand guide so you don’t offend from www.bbc.co.uk. When traveling to:

The United Kingdom—American rules tend to apply, except there is no tipping in bars. Instead you can offer to buy the bartender a drink and he may take you up on it or say he’ll take the money for a drink later.
France and Italy—The tip is included in restaurants so you don’t have to put any additional money down.
Germany—Tipping is rare so in most cases you won’t need to tip.
Japan—There is no tipping and many people will be offended if you try to tip them.
China—You don’t have to tip because foreigners are already charged more for services than locals.
Egypt—You need to tip in most common situations but not taxi drivers.
Mexico—Tipping is very common and most service workers will expect a tip since they are paid very little.
Australia and New Zealand—Tipping is usually included in the price so you don’t need to add on.