You wouldn't be the only one as most of us have done it. But just a few minutes of preparation before you leave could really help you out.
See also: Weird insults around the world
Even if you only know a couple of basic words, it's likely that you'll win over the locals a lot quicker if they can see you're trying. Thankfully, our friends at JetCost are here to help you out.
They've put together a handy infographic that will help you conquer the basics of 39 languages from around the world.
Take a look at the image below to get memorising...