What to tip: While not a local custom, tips are usually expected from foreigners -- but don’t feel obliged to, especially if service was crap. Leave around $1 per person at restaurants, or round up to the nearest 5 baht. More upscale hotels and restos, however, often include a 10% service charge, in which case further tipping isn't expected.
That means: You’ll only have to cough up 100 baht for your Pad Thai Goong at Bangkok’s Munjai Cafe; if you leave a spare 15 baht, expect exceptional service when you come back tomorrow.
What to tip: Nothing. At all. In fact, it’s officially forbidden by the government (like Facebook!).
That means: The xiaolongbau and vegetable dumplings'll set you back ¥101 at Din Tai Fung in Beijing, so leave exactly ¥101 and not a penny more. You're being watched.
What to tip: It’s painful to tip on top of an already astronomical bill, but service is often included, so be sure to inspect your check. If it isn't, throw in another 10-15%. No need to tip in pubs.
That means: Your haddock, chips, and mushy peas at Islington’s top notch Fish & Chip Shop may set you back £15.75; leave an extra 2 quid and you’re good, chap.