Do you have trouble remembering how many days are in each month? When I say "September" or "July" do you know what the last day is?
And don't give me that "Thirty days hath September..." sh*t. If I could remember the damn poem I could remember the number of days in a given month!
The answer lies in you hand, or should I say on top of your hand. In my family we learned a trick that's shown here.