If dating someone with OCD what OCD trait would drive you crazy having to deal with?

If you found yourself dating a person with OCD, what trait or characteristic would drive you utterly crazy? If they had to, for instance, clean the windshield inside and out, and the same with the back window too before you could pull out to the street, need to click and unclick their seat belt X number of times, need to read every item on the menu before they can think of ordering, or need to check all the locks on the doors X number of times before leaving, etc. what OCD or OCD-like trait would drive you batty?

No, I am not dating anyone with OCD and I do not suffer from OCD, so it is not personal to me