the day you were born;
the day you first discover space, as a space tourist;
the day of your first kiss;
the month you spent honeymooning in the Bahamas - or will spend;
the day you first gave a lip-smacking mess of a kiss;
the day you had your first French kiss; 
the beautiful day on Costa Brava beach when you spent a whole hour watching the sunset;
the day the United States became independent;
December 25, 0001 :)
the three months you spent working on your uncle's farm; 
the day you graduated from college;
the day you set up your own company;
the day you launched an Internet startup;
the day the Lumiere brothers invented movie projectors;
the day you went to your first real concert;
the day you become the country's president;
the day you skydived and let out a real Tarzan yell;
the day your dog was born;
the day your team won the championship;
the day you quit smoking;
the day when your dad first let you behind the wheel of your old car; 
the day you invent a mini-nuclear reactor to power cars;
the day the original version of Starcraft was released;
the Battle of Waterloo;
the day your favorite movie came out;
the day Chuck Yeager broke the speed of sound;
the day Chuck Norris decided to let that volcano in Iceland erupt - and scared it into stopping;
the day the Roman Republic fell (or better yet, the entire period!);
the day you found out what the heck sublimation is;
...
So many days - find your own!