This one was fun for me.
This BBC interactive website will tell you about you.
Enter your date of birth, sex, height, weight, and choose metric or imperial.
It will tell you what proportion of you is what elements and what they are worth. How many times your heart has beaten, how far your underarm hair has grown. How many cells of each type you have, and how many days they last.
How much poop you've made, and how many MB of data in your DNA.
And tons more about you.