My parents gave me two middle names. It's not that uncommon in the UK, but due to the length of my names, they don't all fit on a US passport. They force you to choose to truncate or omit some of them. OK, no problem.
But I also hold a UK passport, and the UK passport has a rule that your name must be the same on any other foreign identification, or they won't issue or re-issue a passport. Due to the US length limitation, this was impossible.
Renewing my UK passport wasn't impossible, but it was annoying. None of the automated methods worked, and I had to actually get someone on the phone so I could explain the problem.