Is there ever a time where using a database 1:1 relationship makes sense?

Question

I was thinking the other day on normalization, and it occurred to me, I cannot think of a time where there should be a 1:1 relationship in a database. Name:SSN? I'd have them in the same table PersonID:AddressID? Again, same table. I can come up with a zillion examples of 1:many or many:many (with appropriate intermediate tables), but never a 1:1. Am I missing something obvious?

Answer 1

No, you are generally correct. One example:

A school gives each student a computer to use during the course of a semester. You may have a student table and a computer table. The relationship between them would be one-one.