Ok so tell the officer this! If you don't remember your own, that's ok. The important thing is to be honest and if you don't know something just say you don't know. They won't expect you to know every tiny detail. My opinion, when they ask questions like that, it is to see how you react. Throw you off a little and then come back to something you should know if you're a legit couple. Like they'll say, "What's the color of your husband's toothbrush?" Then when you answer, they'll go back to, "Oh, what's your wedding date again?" Like they forgot but they're just trying to distract you with a silly question to see if that throws you off of a "memorized question"