Good Day for a Hat

Mr. Brown loves hats and cant leave the house without wearing just the right one. But on this day, every time he opens the door to leave, the situation changes, and Mr. Brown must change his hat accordingly. At last, wearing every hat he owns, Mr. Brown is on his way. When he finally arrives at his destination, we find that its Mr. Browns birthday, and his friends have just the right hat for that as well.