Full disclosure: If anyone posts "Why do you drive on a parkway and park in a driveway?" or "Why aren't aeroplanes made out of the same stuff as the black box?" or anything of that nature, I will end you, both with my mod powers and by actually coming to your house and hitting you again and again and again.
That said, as long as it's sincere, there is no question too stupid for this thread, whether it's "Which came first, orange the colour or orange the fruit?" or "How do you make toast without a toaster?", and other people are only allowed to snigger in the privacy of their own homes.
I'll start. Wouldn't it be more sensible to use lunar months instead of calendar months? They conveniently divide up into four weeks and everything.