To tip or not to tip… OMG, this is the biggest stress whenever I visit America. I try my hardest never to eat without a local, so they can just tell me how much to pay on top of the bill. It’s complicated. In the UK, if the service was good, you normally add around 10% if it’s not already included in the bill (I love it when it is – no thinking, just paying!). If you try to tip in Japan, the staff would probably chase you down the road to give it back to you – they hardly ever accept a tip. In Germany, each server has a…