@xiroux my favorite is the US visa application form.
It says to enter your name EXACTLY AS IT APPEARS in your passport.
Then it throws an error that you entered non-English characters.
Do US passports allow accents? UK passports don't: "Due to IT considerations, the British passport will not be issued with a name using numbers, symbols or punctuation marks other than hyphens or apostrophes; or any diacritical marks such as accents."