I got this in an email and thought it was interesting. Just goes to show you that some people have way to much time on their hands. I apologize if it's a repost, I know how you guys get.
1) Key-in the first 3 digits of your phone number into the
calculator (not your area code)
2) Multiply by 80
3) Add 1
4) Multiply by 250
5) Plus last four digit of phone number
6) Plus last four digit of phone number again
7) Minus 250
8) Divide by 2