... how many cylinders are in my car. When the guy who was trying to sell me (and my NICE landlord) a new car battery asked me if I had a 4 or 6 cylinder car, I said "yes". CLEARLY, he was asking me a multiple choice question, not a yes or no. Huh... no idea.
... my blood type. If I need to save a life, it would be important to know if I can. Lucky for me I got a letter the other day from the Red Cross calling me a herO because I have O, the most useful kind of blood!
... that ALL people function better on 9 hours of sleep. I have A LOT of sleep to catch up on.