My own personal aggravating edge case: I have two middle names. 99% of the time I can and do safely pretend the second one doesn't exist, but it sometimes gets tricky when passports are involved.

This kind of form is always interesting. - First name: _____ - Middle name: ______ - Last name: ______ ** Name must match your passport exactly! ** Sometimes I put both middle names in the "middle name" field.