Which of the following is the most interesting question ? (for opting no.6..plz give answers )

1. Why isn’t there mouse-flavored cat food?

2. Why is it that when you’re driving and looking for an address, you turn down the volume on the radio

3. Why doesn’t glue stick to the inside of the bottle ?

4. You know that indestructible black box that is used on airplanes? Why don’t they make the whole plane out of it ?

5. If you are driving at the speed of light and you turn your headlights on, what happens?

6. I know answers to all.. so none of them is interesting according to me.