I've just been sent this by a friend - it's great!
*Pick the number of times a week you'd like to have chocolate (more than once, less than 10)
*then multiply this number by 2
*then add 5
*then multiply by 50
*then add 1759 if you've already had you birthday this year. If you haven't, add 1758
*then subtract the four digit year you were born
and you should end up with a 3 digit number...
The first digit is your original number
and the last 2 are your age!
Cool, huh?