Generally speaking, it’s never a good idea to sign something you can’t read. Unfortunately, it’s not uncommon for international travelers to be asked to do just that, and it’s something that can definitely come back and haunt you later.
For example, the Houston Chronicle interviewed Haroldy Woods, a Texas flight attendant whose travel agent advised her to purchase a Deutsche BahnCard to save money on a train ticket. Woods bought the card because she trusted the travel agent, but she couldn’t read the application, which was all in German. So, she...