Tipping. You don't do it because society says you have to. You think it's for the birds.
Yet despite what you or Mr Pink might think, there's no universal rule for this complex social pitfall. What's expected as a matter of course in the USA might get you arrested in Argentina.
Thankfully, the travel-minded bods at Wego are looking to educated the ill-informed tourists amongst us. Their painfully simple chart gives vital at-a-glance information on where a tip is 'required' (if only to save yourself being thrown from the bar), included to reflect your contentment with the service, or just a downright insult to leave one (they'll assume you thought they got the bill wrong).